diff --git a/configs/sim/axis/plasma/imperial.ini b/configs/sim/axis/plasma/imperial.ini
index a86417ab27d..191753ece71 100644
--- a/configs/sim/axis/plasma/imperial.ini
+++ b/configs/sim/axis/plasma/imperial.ini
@@ -30,7 +30,7 @@ MAX_FEED_OVERRIDE       = 1.5
 PROGRAM_PREFIX          = ../../nc_files
 INTRO_GRAPHIC           = linuxcnc.gif
 INTRO_TIME              = 1
-CYCLE_TIME              = 100
+CYCLE_TIME              = 0.100
 INCREMENTS              = 1, .1, .01, .001, .0001
 MDI_HISTORY_FILE        = imperial_mdi_history.txt
 OPEN_FILE               = ""
diff --git a/configs/sim/axis/plasma/metric.ini b/configs/sim/axis/plasma/metric.ini
index d9d7d8ad745..59eda7ede61 100644
--- a/configs/sim/axis/plasma/metric.ini
+++ b/configs/sim/axis/plasma/metric.ini
@@ -30,7 +30,7 @@ MAX_FEED_OVERRIDE       = 1.5
 PROGRAM_PREFIX          = ../../nc_files
 INTRO_GRAPHIC           = linuxcnc.gif
 INTRO_TIME              = 1
-CYCLE_TIME              = 100
+CYCLE_TIME              = 0.100
 INCREMENTS              = 10, 1, .1, .01, .001
 MDI_HISTORY_FILE        = metric_mdi_history.txt
 OPEN_FILE               = ""
diff --git a/configs/sim/axis/plasma/plasmac2/migrate.py b/configs/sim/axis/plasma/plasmac2/migrate.py
index ed38d79b384..3eb1b12a49e 100755
--- a/configs/sim/axis/plasma/plasmac2/migrate.py
+++ b/configs/sim/axis/plasma/plasmac2/migrate.py
@@ -263,7 +263,7 @@ def do_ini_file(self):
                 config[lNum] = 'TOOL_EDITOR = tooledit x y\n'
                 done.append('te')
             elif section[lNum].startswith('CYCLE_TIME') and 'ct' not in done:
-                config[lNum] = 'CYCLE_TIME = 100\n'
+                config[lNum] = 'CYCLE_TIME = 0.100\n'
                 done.append('ct')
             elif section[lNum].startswith('USER_COMMAND_FILE') and 'uc' not in done:
                 config[lNum] = 'USER_COMMAND_FILE = ./plasmac2/plasmac2.py\n'
@@ -282,7 +282,7 @@ def do_ini_file(self):
             elif option == 'te' and option not in done:
                 config.insert(insert,'TOOL_EDITOR = tooledit x y\n')
             elif option == 'ct' and option not in done:
-                config.insert(insert,'CYCLE_TIME = 100\n')
+                config.insert(insert,'CYCLE_TIME = 0.100\n')
             elif option == 'uc' and option not in done:
                 config.insert(insert,'USER_COMMAND_FILE = ./plasmac2/plasmac2.py\n')
             elif option == 'po' and option not in done:
diff --git a/configs/sim/gmoccapy/6_axis.ini b/configs/sim/gmoccapy/6_axis.ini
index 4a1a0179f8c..d57fc01caca 100644
--- a/configs/sim/gmoccapy/6_axis.ini
+++ b/configs/sim/gmoccapy/6_axis.ini
@@ -5,7 +5,7 @@ MACHINE = gmoccapy_9_axis
 
 [DISPLAY]
 DISPLAY = gmoccapy
-CYCLE_TIME = 150
+CYCLE_TIME = 0.150
 POSITION_OFFSET = RELATIVE
 POSITION_FEEDBACK = ACTUAL
 PROGRAM_PREFIX = ../../nc_files/
diff --git a/configs/sim/gmoccapy/7_axis.ini b/configs/sim/gmoccapy/7_axis.ini
index e5d25e7fddb..67c05bc2fce 100644
--- a/configs/sim/gmoccapy/7_axis.ini
+++ b/configs/sim/gmoccapy/7_axis.ini
@@ -5,7 +5,7 @@ MACHINE = gmoccapy_9_axis
 
 [DISPLAY]
 DISPLAY = gmoccapy
-CYCLE_TIME = 150
+CYCLE_TIME = 0.150
 POSITION_OFFSET = RELATIVE
 POSITION_FEEDBACK = ACTUAL
 PROGRAM_PREFIX = ../../nc_files/
diff --git a/configs/sim/gmoccapy/7_axis_tool.ini b/configs/sim/gmoccapy/7_axis_tool.ini
index 62c9b2578a3..0269d15b12c 100644
--- a/configs/sim/gmoccapy/7_axis_tool.ini
+++ b/configs/sim/gmoccapy/7_axis_tool.ini
@@ -5,7 +5,7 @@ MACHINE = gmoccapy_9_axis
 
 [DISPLAY]
 DISPLAY = gmoccapy
-CYCLE_TIME = 150
+CYCLE_TIME = 0.150
 POSITION_OFFSET = RELATIVE
 POSITION_FEEDBACK = ACTUAL
 PROGRAM_PREFIX = ../../nc_files/
diff --git a/configs/sim/gmoccapy/8_axis.ini b/configs/sim/gmoccapy/8_axis.ini
index bbfd5b65dde..6e430399001 100644
--- a/configs/sim/gmoccapy/8_axis.ini
+++ b/configs/sim/gmoccapy/8_axis.ini
@@ -5,7 +5,7 @@ MACHINE = gmoccapy_9_axis
 
 [DISPLAY]
 DISPLAY = gmoccapy
-CYCLE_TIME = 150
+CYCLE_TIME = 0.150
 POSITION_OFFSET = RELATIVE
 POSITION_FEEDBACK = ACTUAL
 PROGRAM_PREFIX = ../../nc_files/
diff --git a/configs/sim/gmoccapy/9_axis.ini b/configs/sim/gmoccapy/9_axis.ini
index 33fac9bce8d..6651d3cfad3 100644
--- a/configs/sim/gmoccapy/9_axis.ini
+++ b/configs/sim/gmoccapy/9_axis.ini
@@ -5,7 +5,7 @@ MACHINE = gmoccapy_9_axis
 
 [DISPLAY]
 DISPLAY = gmoccapy
-CYCLE_TIME = 150
+CYCLE_TIME = 0.150
 POSITION_OFFSET = RELATIVE
 POSITION_FEEDBACK = ACTUAL
 PROGRAM_PREFIX = ../../nc_files/
diff --git a/configs/sim/gmoccapy/gmoccapy.ini b/configs/sim/gmoccapy/gmoccapy.ini
index 217ae378d61..dbc8d1aa030 100644
--- a/configs/sim/gmoccapy/gmoccapy.ini
+++ b/configs/sim/gmoccapy/gmoccapy.ini
@@ -19,7 +19,7 @@ DISPLAY = gmoccapy
 # ERROR       -q
 
 # Cycle time, in milliseconds, that display will sleep between polls
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 
 # Values that will be allowed for override, 1.0 = 100%
 MAX_FEED_OVERRIDE    = 1.5
diff --git a/configs/sim/gmoccapy/gmoccapy_4_axis.ini b/configs/sim/gmoccapy/gmoccapy_4_axis.ini
index 34e0bd18085..8d07a7ab90a 100644
--- a/configs/sim/gmoccapy/gmoccapy_4_axis.ini
+++ b/configs/sim/gmoccapy/gmoccapy_4_axis.ini
@@ -9,7 +9,7 @@ DEBUG = 0
 DISPLAY = gmoccapy
 
 # Cycle time, in milliseconds, that display will sleep between polls
-CYCLE_TIME =            100
+CYCLE_TIME =            0.100
 
 # Highest value that will be allowed for feed override, 1.0 = 100%
 MAX_FEED_OVERRIDE =     1.5
diff --git a/configs/sim/gmoccapy/gmoccapy_800x600.ini b/configs/sim/gmoccapy/gmoccapy_800x600.ini
index 8c2f29bdca9..4db0639daf0 100644
--- a/configs/sim/gmoccapy/gmoccapy_800x600.ini
+++ b/configs/sim/gmoccapy/gmoccapy_800x600.ini
@@ -18,7 +18,7 @@ DISPLAY = gmoccapy -i
 # ERROR       -q
 
 # Cycle time, in milliseconds, that display will sleep between polls
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 
 # Values that will be allowed for override, 1.0 = 100%
 MAX_FEED_OVERRIDE    = 1.5
diff --git a/configs/sim/gmoccapy/gmoccapy_XYZAB.ini b/configs/sim/gmoccapy/gmoccapy_XYZAB.ini
index 75c0997fcd4..4cf30ac3fae 100644
--- a/configs/sim/gmoccapy/gmoccapy_XYZAB.ini
+++ b/configs/sim/gmoccapy/gmoccapy_XYZAB.ini
@@ -31,7 +31,7 @@ DISPLAY = gmoccapy
 
 
 # Cycle time, in milliseconds, that display will sleep between polls
-CYCLE_TIME =            100
+CYCLE_TIME =            0.100
 
 # Highest value that will be allowed for feed override, 1.0 = 100%
 MAX_FEED_OVERRIDE =     1.5
diff --git a/configs/sim/gmoccapy/gmoccapy_XYZAC.ini b/configs/sim/gmoccapy/gmoccapy_XYZAC.ini
index 1b9348e4742..6c6fc6c8022 100644
--- a/configs/sim/gmoccapy/gmoccapy_XYZAC.ini
+++ b/configs/sim/gmoccapy/gmoccapy_XYZAC.ini
@@ -22,7 +22,7 @@ EMBED_TAB_LOCATION = box_right
 EMBED_TAB_COMMAND = gladevcp -H pendant_5_axis.hal pendant_5_axis.glade
 
 # Cycle time, in milliseconds, that display will sleep between polls
-CYCLE_TIME =            100
+CYCLE_TIME =            0.100
 
 # Highest value that will be allowed for feed override, 1.0 = 100%
 MAX_FEED_OVERRIDE =     1.5
diff --git a/configs/sim/gmoccapy/gmoccapy_XYZCW.ini b/configs/sim/gmoccapy/gmoccapy_XYZCW.ini
index 9fbb984d4f7..9e66f49c30f 100644
--- a/configs/sim/gmoccapy/gmoccapy_XYZCW.ini
+++ b/configs/sim/gmoccapy/gmoccapy_XYZCW.ini
@@ -18,7 +18,7 @@ DEBUG = 0
 DISPLAY = gmoccapy
 
 # Cycle time, in milliseconds, that display will sleep between polls
-CYCLE_TIME =            100
+CYCLE_TIME =            0.100
 
 # Highest value that will be allowed for feed override, 1.0 = 100%
 MAX_FEED_OVERRIDE =     1.5
diff --git a/configs/sim/gmoccapy/gmoccapy_blockdelete.ini b/configs/sim/gmoccapy/gmoccapy_blockdelete.ini
index 4043aa966d9..929290c0eaf 100644
--- a/configs/sim/gmoccapy/gmoccapy_blockdelete.ini
+++ b/configs/sim/gmoccapy/gmoccapy_blockdelete.ini
@@ -18,7 +18,7 @@ EMBED_TAB_LOCATION = box_custom_4
 EMBED_TAB_COMMAND = gladevcp -x {XID} -c blockdelete -H blockdelete.hal -u blockdelete.py blockdelete.glade
 
 # Cycle time, in milliseconds, that display will sleep between polls
-CYCLE_TIME =            100
+CYCLE_TIME =            0.100
 
 # Values that will be allowed for override, 1.0 = 100%
 MAX_FEED_OVERRIDE    =  1.5
diff --git a/configs/sim/gmoccapy/gmoccapy_left_panel.ini b/configs/sim/gmoccapy/gmoccapy_left_panel.ini
index 52c9d8b3a30..bb62baed7d8 100644
--- a/configs/sim/gmoccapy/gmoccapy_left_panel.ini
+++ b/configs/sim/gmoccapy/gmoccapy_left_panel.ini
@@ -18,7 +18,7 @@ EMBED_TAB_LOCATION = box_left
 EMBED_TAB_COMMAND = gladevcp -x {XID} -H v_buttonlist.hal v_buttonlist.glade
 
 # Cycle time, in milliseconds, that display will sleep between polls
-CYCLE_TIME =            100
+CYCLE_TIME =            0.100
 
 # Highest value that will be allowed for feed override, 1.0 = 100%
 MAX_FEED_OVERRIDE =     1.5
diff --git a/configs/sim/gmoccapy/gmoccapy_messages.ini b/configs/sim/gmoccapy/gmoccapy_messages.ini
index 705f051028f..039686670ff 100644
--- a/configs/sim/gmoccapy/gmoccapy_messages.ini
+++ b/configs/sim/gmoccapy/gmoccapy_messages.ini
@@ -14,7 +14,7 @@ DEBUG = 0
 DISPLAY = gmoccapy
 
 # Cycle time, in milliseconds, that display will sleep between polls
-CYCLE_TIME =            100
+CYCLE_TIME =            0.100
 
 # Highest value that will be allowed for feed override, 1.0 = 100%
 MAX_FEED_OVERRIDE =     1.5
diff --git a/configs/sim/gmoccapy/gmoccapy_pedant.ini b/configs/sim/gmoccapy/gmoccapy_pedant.ini
index 8ca75a3fd8c..9fc0762038e 100644
--- a/configs/sim/gmoccapy/gmoccapy_pedant.ini
+++ b/configs/sim/gmoccapy/gmoccapy_pedant.ini
@@ -18,7 +18,7 @@ EMBED_TAB_LOCATION = box_right
 EMBED_TAB_COMMAND = gladevcp -H pendant.hal pendant.glade
 
 # Cycle time, in milliseconds, that display will sleep between polls
-CYCLE_TIME =            100
+CYCLE_TIME =            0.100
 
 # Highest value that will be allowed for feed override, 1.0 = 100%
 MAX_FEED_OVERRIDE =     1.5
diff --git a/configs/sim/gmoccapy/gmoccapy_pyngcgui.ini b/configs/sim/gmoccapy/gmoccapy_pyngcgui.ini
index 6bfc5c446a9..6021a9d6ccf 100644
--- a/configs/sim/gmoccapy/gmoccapy_pyngcgui.ini
+++ b/configs/sim/gmoccapy/gmoccapy_pyngcgui.ini
@@ -46,7 +46,7 @@ NGCGUI_SUBFILE    = ""
 
 
 # Cycle time, in milliseconds, that display will sleep between polls
-CYCLE_TIME =            100
+CYCLE_TIME =            0.100
 
 # Values that will be allowed for override, 1.0 = 100%
 MAX_FEED_OVERRIDE    =  1.5
diff --git a/configs/sim/gmoccapy/gmoccapy_pyngcgui_gcmc.ini b/configs/sim/gmoccapy/gmoccapy_pyngcgui_gcmc.ini
index de4a5e50836..f36ef79e999 100644
--- a/configs/sim/gmoccapy/gmoccapy_pyngcgui_gcmc.ini
+++ b/configs/sim/gmoccapy/gmoccapy_pyngcgui_gcmc.ini
@@ -58,7 +58,7 @@ TTT_PREAMBLE      = in_std.ngc
 
 
 # Cycle time, in milliseconds, that display will sleep between polls
-CYCLE_TIME =            100
+CYCLE_TIME =            0.100
 
 # Values that will be allowed for override, 1.0 = 100%
 MAX_FEED_OVERRIDE    =  1.5
diff --git a/configs/sim/gmoccapy/gmoccapy_qt_messages.ini b/configs/sim/gmoccapy/gmoccapy_qt_messages.ini
index d15480633da..e9440ee6f90 100644
--- a/configs/sim/gmoccapy/gmoccapy_qt_messages.ini
+++ b/configs/sim/gmoccapy/gmoccapy_qt_messages.ini
@@ -18,7 +18,7 @@ DISPLAY = gmoccapy -d
 # ERROR       -q
 
 # Cycle time, in milliseconds, that display will sleep between polls
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 
 # Values that will be allowed for override, 1.0 = 100%
 MAX_FEED_OVERRIDE    = 1.5
diff --git a/configs/sim/gmoccapy/gmoccapy_right_panel.ini b/configs/sim/gmoccapy/gmoccapy_right_panel.ini
index 62213d687d5..412af001374 100644
--- a/configs/sim/gmoccapy/gmoccapy_right_panel.ini
+++ b/configs/sim/gmoccapy/gmoccapy_right_panel.ini
@@ -14,7 +14,7 @@ EMBED_TAB_LOCATION = box_right
 EMBED_TAB_COMMAND = gladevcp -x {XID} -H vcp_box.hal vcp_box.glade
 
 # Cycle time, in milliseconds, that display will sleep between polls
-CYCLE_TIME =            100
+CYCLE_TIME =            0.100
 
 # Highest value that will be allowed for feed override, 1.0 = 100%
 MAX_FEED_OVERRIDE =     1.5
diff --git a/configs/sim/gmoccapy/gmoccapy_sim_hardware_button.ini b/configs/sim/gmoccapy/gmoccapy_sim_hardware_button.ini
index 704e64d796d..33822c1fc38 100644
--- a/configs/sim/gmoccapy/gmoccapy_sim_hardware_button.ini
+++ b/configs/sim/gmoccapy/gmoccapy_sim_hardware_button.ini
@@ -21,7 +21,7 @@ EMBED_TAB_LOCATION = box_right
 EMBED_TAB_COMMAND = gladevcp -g 995x64+0+805 -H h_buttonlist.hal h_buttonlist.glade
 
 # Cycle time, in milliseconds, that display will sleep between polls
-CYCLE_TIME =            100
+CYCLE_TIME =            0.100
 
 # Highest value that will be allowed for feed override, 1.0 = 100%
 MAX_FEED_OVERRIDE =     1.5
diff --git a/configs/sim/gmoccapy/gmoccapy_tool_sensor.ini b/configs/sim/gmoccapy/gmoccapy_tool_sensor.ini
index 37daf107549..43a0adfa928 100644
--- a/configs/sim/gmoccapy/gmoccapy_tool_sensor.ini
+++ b/configs/sim/gmoccapy/gmoccapy_tool_sensor.ini
@@ -26,7 +26,7 @@ EMBED_TAB_LOCATION = box_right
 EMBED_TAB_COMMAND = gladevcp -x {XID} -H tool_sensor.hal tool_sensor.glade
 
 # Cycle time, in milliseconds, that display will sleep between polls
-CYCLE_TIME =            100
+CYCLE_TIME =            0.100
 
 # Highest value that will be allowed for feed override, 1.0 = 100%
 MAX_FEED_OVERRIDE =     1.5
diff --git a/configs/sim/gmoccapy/gmoccapy_with_user_tabs.ini b/configs/sim/gmoccapy/gmoccapy_with_user_tabs.ini
index 9ac53efa54b..31150bbacc1 100644
--- a/configs/sim/gmoccapy/gmoccapy_with_user_tabs.ini
+++ b/configs/sim/gmoccapy/gmoccapy_with_user_tabs.ini
@@ -38,7 +38,7 @@ EMBED_TAB_COMMAND = gladevcp -q -x {XID} -H vcp_box.hal vcp_box.glade
 #EMBED_TAB_COMMAND = camview-emc -w {XID}
 
 # Cycle time, in milliseconds, that display will sleep between polls
-CYCLE_TIME =            100
+CYCLE_TIME =            0.100
 
 # Highest value that will be allowed for feed override, 1.0 = 100%
 MAX_FEED_OVERRIDE =     1.5
diff --git a/configs/sim/gmoccapy/lathe_configs/lathe.ini b/configs/sim/gmoccapy/lathe_configs/lathe.ini
index 71da9ff283d..18e6ed4b9ed 100644
--- a/configs/sim/gmoccapy/lathe_configs/lathe.ini
+++ b/configs/sim/gmoccapy/lathe_configs/lathe.ini
@@ -16,7 +16,7 @@ LATHE = 1
 BACK_TOOL_LATHE = 0
 
 # Cycle time, in milliseconds, that display will sleep between polls
-CYCLE_TIME =            100
+CYCLE_TIME =            0.100
 
 # Highest value that will be allowed for feed override, 1.0 = 100%
 MAX_FEED_OVERRIDE =     1.5
diff --git a/configs/sim/gmoccapy/lathe_configs/lathe_C.ini b/configs/sim/gmoccapy/lathe_configs/lathe_C.ini
index b47ec8d569d..a07b51b5709 100644
--- a/configs/sim/gmoccapy/lathe_configs/lathe_C.ini
+++ b/configs/sim/gmoccapy/lathe_configs/lathe_C.ini
@@ -16,7 +16,7 @@ LATHE = 1
 BACK_TOOL_LATHE = 0
 
 # Cycle time, in milliseconds, that display will sleep between polls
-CYCLE_TIME =            100
+CYCLE_TIME =            0.100
 
 # Highest value that will be allowed for feed override, 1.0 = 100%
 MAX_FEED_OVERRIDE =     1.5
diff --git a/configs/sim/gmoccapy/lathe_configs/lathe_CW.ini b/configs/sim/gmoccapy/lathe_configs/lathe_CW.ini
index e5bd6640c33..8fece8c3c4f 100644
--- a/configs/sim/gmoccapy/lathe_configs/lathe_CW.ini
+++ b/configs/sim/gmoccapy/lathe_configs/lathe_CW.ini
@@ -16,7 +16,7 @@ LATHE = 1
 BACK_TOOL_LATHE = 0
 
 # Cycle time, in milliseconds, that display will sleep between polls
-CYCLE_TIME =            100
+CYCLE_TIME =            0.100
 
 # Highest value that will be allowed for feed override, 1.0 = 100%
 MAX_FEED_OVERRIDE =     1.5
diff --git a/configs/sim/gmoccapy/lathe_configs/lathe_backtool.ini b/configs/sim/gmoccapy/lathe_configs/lathe_backtool.ini
index b49ae755431..f2d412ca466 100644
--- a/configs/sim/gmoccapy/lathe_configs/lathe_backtool.ini
+++ b/configs/sim/gmoccapy/lathe_configs/lathe_backtool.ini
@@ -16,7 +16,7 @@ LATHE = 1
 BACK_TOOL_LATHE = 1
 
 # Cycle time, in milliseconds, that display will sleep between polls
-CYCLE_TIME =            100
+CYCLE_TIME =            0.100
 
 # Highest value that will be allowed for feed override, 1.0 = 100%
 MAX_FEED_OVERRIDE =     1.5
diff --git a/configs/sim/gmoccapy/lathe_configs/lathe_imperial.ini b/configs/sim/gmoccapy/lathe_configs/lathe_imperial.ini
index e95ffdd29ac..192c788ece7 100644
--- a/configs/sim/gmoccapy/lathe_configs/lathe_imperial.ini
+++ b/configs/sim/gmoccapy/lathe_configs/lathe_imperial.ini
@@ -17,7 +17,7 @@ LATHE = 1
 BACK_TOOL_LATHE = 0
 
 # Cycle time, in milliseconds, that display will sleep between polls
-CYCLE_TIME =            100
+CYCLE_TIME =            0.100
 
 # Highest value that will be allowed for feed override, 1.0 = 100%
 MAX_FEED_OVERRIDE =     1.5
diff --git a/configs/sim/gmoccapy/lathe_configs/lathe_macros.ini b/configs/sim/gmoccapy/lathe_configs/lathe_macros.ini
index c3a49f61433..537baf04c69 100644
--- a/configs/sim/gmoccapy/lathe_configs/lathe_macros.ini
+++ b/configs/sim/gmoccapy/lathe_configs/lathe_macros.ini
@@ -16,7 +16,7 @@ LATHE = 1
 BACK_TOOL_LATHE = 0
 
 # Cycle time, in milliseconds, that display will sleep between polls
-CYCLE_TIME =            100
+CYCLE_TIME =            0.100
 
 # Highest value that will be allowed for feed override, 1.0 = 100%
 MAX_FEED_OVERRIDE =     1.5
diff --git a/configs/sim/gmoccapy/plasma_config/gmoccapy_plasma.ini b/configs/sim/gmoccapy/plasma_config/gmoccapy_plasma.ini
index 5e0dffb5895..5fa36351a20 100644
--- a/configs/sim/gmoccapy/plasma_config/gmoccapy_plasma.ini
+++ b/configs/sim/gmoccapy/plasma_config/gmoccapy_plasma.ini
@@ -23,7 +23,7 @@ EMBED_TAB_LOCATION = box_coolant_and_spindle
 EMBED_TAB_COMMAND = gladevcp -x {XID} -u plasma.py -H plasma.hal plasma.glade
 
 # Cycle time, in milliseconds, that display will sleep between polls
-CYCLE_TIME =            100
+CYCLE_TIME =            0.100
 
 # Highest value that will be allowed for feed override, 1.0 = 100%
 MAX_FEED_OVERRIDE =     1.5
diff --git a/configs/sim/gscreen/gscreen.ini b/configs/sim/gscreen/gscreen.ini
index 42b90a1c5f5..3a0f44fa253 100644
--- a/configs/sim/gscreen/gscreen.ini
+++ b/configs/sim/gscreen/gscreen.ini
@@ -23,7 +23,7 @@ DEBUG = 0
 DISPLAY = gscreen
 
 # Cycle time, in milliseconds, that display will sleep between polls
-CYCLE_TIME =            100
+CYCLE_TIME =            0.100
 
 # Highest / lowest value that will be allowed for overrides, 1.0 = 100%
 MAX_SPINDLE_OVERRIDE = 2.0
diff --git a/configs/sim/gscreen/gscreen_custom/9axis.ini b/configs/sim/gscreen/gscreen_custom/9axis.ini
index 89ff1072083..df7d9e91fd3 100644
--- a/configs/sim/gscreen/gscreen_custom/9axis.ini
+++ b/configs/sim/gscreen/gscreen_custom/9axis.ini
@@ -22,7 +22,7 @@ DEBUG = 0
 DISPLAY =             gscreen -c 9_axis
 
 # Cycle time, in milliseconds, that display will sleep between polls
-CYCLE_TIME =            100
+CYCLE_TIME =            0.100
 
 # Highest / lowest value that will be allowed for overrides, 1.0 = 100%
 MAX_SPINDLE_OVERRIDE = 2.0
diff --git a/configs/sim/gscreen/gscreen_custom/gaxis_no_plot.ini b/configs/sim/gscreen/gscreen_custom/gaxis_no_plot.ini
index e91dd76845b..2fc76719e4b 100644
--- a/configs/sim/gscreen/gscreen_custom/gaxis_no_plot.ini
+++ b/configs/sim/gscreen/gscreen_custom/gaxis_no_plot.ini
@@ -23,7 +23,7 @@ DEBUG = 0
 DISPLAY = gscreen -c gaxis_no_plot -c
 
 # Cycle time, in milliseconds, that display will sleep between polls
-CYCLE_TIME =            100
+CYCLE_TIME =            0.100
 
 # Highest / lowest value that will be allowed for overrides, 1.0 = 100%
 MAX_FEED_OVERRIDE =     2.0
diff --git a/configs/sim/gscreen/gscreen_custom/gscreen_gaxis.ini b/configs/sim/gscreen/gscreen_custom/gscreen_gaxis.ini
index d27ba0bd229..cbd2800de43 100644
--- a/configs/sim/gscreen/gscreen_custom/gscreen_gaxis.ini
+++ b/configs/sim/gscreen/gscreen_custom/gscreen_gaxis.ini
@@ -23,7 +23,7 @@ DEBUG = 0
 DISPLAY = gscreen -c gaxis -c
 
 # Cycle time, in milliseconds, that display will sleep between polls
-CYCLE_TIME =            100
+CYCLE_TIME =            0.100
 
 # Highest / lowest value that will be allowed for overrides, 1.0 = 100%
 MAX_FEED_OVERRIDE =     2.0
diff --git a/configs/sim/gscreen/gscreen_custom/industrial.ini b/configs/sim/gscreen/gscreen_custom/industrial.ini
index 0aa100bbfd8..f46be2e76b8 100644
--- a/configs/sim/gscreen/gscreen_custom/industrial.ini
+++ b/configs/sim/gscreen/gscreen_custom/industrial.ini
@@ -22,7 +22,7 @@ DEBUG = 0
 DISPLAY = gscreen -c industrial -d
 
 # Cycle time, in milliseconds, that display will sleep between polls
-CYCLE_TIME =            100
+CYCLE_TIME =            0.100
 
 # Highest / lowest value that will be allowed for overrides, 1.0 = 100%
 MAX_FEED_OVERRIDE =     1.2
diff --git a/configs/sim/gscreen/gscreen_custom/tester.ini b/configs/sim/gscreen/gscreen_custom/tester.ini
index 3b6f6145815..797bb238e63 100644
--- a/configs/sim/gscreen/gscreen_custom/tester.ini
+++ b/configs/sim/gscreen/gscreen_custom/tester.ini
@@ -23,7 +23,7 @@ DEBUG = 0
 DISPLAY = gscreen -c tester -d
 
 # Cycle time, in milliseconds, that display will sleep between polls
-CYCLE_TIME =            100
+CYCLE_TIME =            0.100
 
 # Prefix to be used
 PROGRAM_PREFIX = ../../../nc_files/
diff --git a/configs/sim/gscreen/gscreen_custom/tester_metric.ini b/configs/sim/gscreen/gscreen_custom/tester_metric.ini
index e9d51848396..09ac01794fb 100644
--- a/configs/sim/gscreen/gscreen_custom/tester_metric.ini
+++ b/configs/sim/gscreen/gscreen_custom/tester_metric.ini
@@ -23,7 +23,7 @@ DEBUG = 0
 DISPLAY = gscreen -c tester -d
 
 # Cycle time, in milliseconds, that display will sleep between polls
-CYCLE_TIME =            100
+CYCLE_TIME =            0.100
 
 # Highest / lowest value that will be allowed for overrides, 1.0 = 100%
 MAX_SPINDLE_OVERRIDE =      2.0
diff --git a/configs/sim/gscreen/gscreen_mm.ini b/configs/sim/gscreen/gscreen_mm.ini
index fb27c3da7c8..2c3e28fc05c 100644
--- a/configs/sim/gscreen/gscreen_mm.ini
+++ b/configs/sim/gscreen/gscreen_mm.ini
@@ -23,7 +23,7 @@ DEBUG = 0
 DISPLAY = gscreen
 
 # Cycle time, in milliseconds, that display will sleep between polls
-CYCLE_TIME =            100
+CYCLE_TIME =            0.100
 
 # Highest / lowest value that will be allowed for overrides, 1.0 = 100%
 MAX_SPINDLE_OVERRIDE =      2.0
diff --git a/configs/sim/gscreen/ngcgui/pyngcgui_gscreen.ini b/configs/sim/gscreen/ngcgui/pyngcgui_gscreen.ini
index bbc2903e276..dd440ecb6d3 100644
--- a/configs/sim/gscreen/ngcgui/pyngcgui_gscreen.ini
+++ b/configs/sim/gscreen/ngcgui/pyngcgui_gscreen.ini
@@ -33,7 +33,7 @@ NGCGUI_SUBFILE    = iquad.ngc
 NGCGUI_SUBFILE    = qpocket.ngc
 NGCGUI_SUBFILE    = ""
 
-CYCLE_TIME =            300
+CYCLE_TIME =            0.300
 MAX_SPINDLE_OVERRIDE = 2.0
 MIN_SPINDLE_OVERRIDE = .5
 MAX_FEED_OVERRIDE = 2.0
diff --git a/configs/sim/gscreen/ngcgui/pyngcgui_gscreen_popupkeyboard.ini b/configs/sim/gscreen/ngcgui/pyngcgui_gscreen_popupkeyboard.ini
index cba1b603180..fb90d8ac85b 100644
--- a/configs/sim/gscreen/ngcgui/pyngcgui_gscreen_popupkeyboard.ini
+++ b/configs/sim/gscreen/ngcgui/pyngcgui_gscreen_popupkeyboard.ini
@@ -33,7 +33,7 @@ NGCGUI_SUBFILE    = iquad.ngc
 NGCGUI_SUBFILE    = qpocket.ngc
 NGCGUI_SUBFILE    = ""
 
-CYCLE_TIME =            300
+CYCLE_TIME =            0.300
 MAX_SPINDLE_OVERRIDE = 2.0
 MIN_SPINDLE_OVERRIDE = .5
 MAX_FEED_OVERRIDE = 2.0
diff --git a/configs/sim/gscreen/silverdragon/silverdragon.ini b/configs/sim/gscreen/silverdragon/silverdragon.ini
index fe2e27123d9..853bef42ae3 100644
--- a/configs/sim/gscreen/silverdragon/silverdragon.ini
+++ b/configs/sim/gscreen/silverdragon/silverdragon.ini
@@ -13,7 +13,7 @@ DEBUG = 0
 [DISPLAY]
 DISPLAY = gscreen -c silverdragon
 # Cycle time, in milliseconds, that display will sleep between polls
-CYCLE_TIME =            100
+CYCLE_TIME =            0.100
 #PREFERENCE_FILE_PATH = /home/jim/linuxcnc/configs/sim.gscreen.gscreen_custom/silverdragon.pref
 # Values that will be allowed for override, 1.0 = 100%
 MAX_FEED_OVERRIDE    =  1.5
diff --git a/configs/sim/qtaxis/non-trivial/scara/scara.ini b/configs/sim/qtaxis/non-trivial/scara/scara.ini
index 00ea3d2a1ca..e1a9c853255 100644
--- a/configs/sim/qtaxis/non-trivial/scara/scara.ini
+++ b/configs/sim/qtaxis/non-trivial/scara/scara.ini
@@ -41,7 +41,7 @@ DEFAULT_LINEAR_VELOCITY = 50.0
 # incremental jog step length options
 INCREMENTS = 10 mm, 1.0 mm, 0.10 mm, 0.01 mm, 1.0 inch, 0.1 inch, 0.01 inch
 
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 INTRO_GRAPHIC = silver_dragon.png
 INTRO_TIME = 2
 
diff --git a/configs/sim/qtdragon/qtdragon_multi_joint/qtdragon_xyyz.ini b/configs/sim/qtdragon/qtdragon_multi_joint/qtdragon_xyyz.ini
index 8c16d5e1d20..18c3edcbdf0 100644
--- a/configs/sim/qtdragon/qtdragon_multi_joint/qtdragon_xyyz.ini
+++ b/configs/sim/qtdragon/qtdragon_multi_joint/qtdragon_xyyz.ini
@@ -43,7 +43,7 @@ DEFAULT_LINEAR_VELOCITY = 50.0
 # incremental jog step length options
 INCREMENTS = 10 mm, 1.0 mm, 0.10 mm, 0.01 mm, 1.0 inch, 0.1 inch, 0.01 inch
 
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 INTRO_GRAPHIC = silver_dragon.png
 INTRO_TIME = 2
 
diff --git a/configs/sim/qtdragon/qtdragon_multi_joint/qtdragon_xyyzw.ini b/configs/sim/qtdragon/qtdragon_multi_joint/qtdragon_xyyzw.ini
index b3614ef512a..daa6718844d 100644
--- a/configs/sim/qtdragon/qtdragon_multi_joint/qtdragon_xyyzw.ini
+++ b/configs/sim/qtdragon/qtdragon_multi_joint/qtdragon_xyyzw.ini
@@ -43,7 +43,7 @@ DEFAULT_LINEAR_VELOCITY = 50.0
 # incremental jog step length options
 INCREMENTS = 10 mm, 1.0 mm, 0.10 mm, 0.01 mm, 1.0 inch, 0.1 inch, 0.01 inch
 
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 INTRO_GRAPHIC = silver_dragon.png
 INTRO_TIME = 2
 
diff --git a/configs/sim/qtdragon/qtdragon_multi_joint/qtdragon_xyzy.ini b/configs/sim/qtdragon/qtdragon_multi_joint/qtdragon_xyzy.ini
index 1430466c4dc..fd2dd0b8d56 100644
--- a/configs/sim/qtdragon/qtdragon_multi_joint/qtdragon_xyzy.ini
+++ b/configs/sim/qtdragon/qtdragon_multi_joint/qtdragon_xyzy.ini
@@ -43,7 +43,7 @@ DEFAULT_LINEAR_VELOCITY = 50.0
 # incremental jog step length options
 INCREMENTS = 10 mm, 1.0 mm, 0.10 mm, 0.01 mm, 1.0 inch, 0.1 inch, 0.01 inch
 
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 INTRO_GRAPHIC = silver_dragon.png
 INTRO_TIME = 2
 
diff --git a/configs/sim/qtdragon/qtdragon_multi_joint/qtdragon_xyzya.ini b/configs/sim/qtdragon/qtdragon_multi_joint/qtdragon_xyzya.ini
index e37a803deae..10c703c6084 100644
--- a/configs/sim/qtdragon/qtdragon_multi_joint/qtdragon_xyzya.ini
+++ b/configs/sim/qtdragon/qtdragon_multi_joint/qtdragon_xyzya.ini
@@ -47,7 +47,7 @@ MAX_ANGULAR_VELOCITY = 360
 # incremental jog step length options
 INCREMENTS = 10 mm, 1.0 mm, 0.10 mm, 0.01 mm, 1.0 inch, 0.1 inch, 0.01 inch
 
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 INTRO_GRAPHIC = silver_dragon.png
 INTRO_TIME = 2
 
diff --git a/configs/sim/qtdragon/qtdragon_multi_joint/qtdragon_yyxz.ini b/configs/sim/qtdragon/qtdragon_multi_joint/qtdragon_yyxz.ini
index 54631bbbfd8..08fae5bc0b4 100644
--- a/configs/sim/qtdragon/qtdragon_multi_joint/qtdragon_yyxz.ini
+++ b/configs/sim/qtdragon/qtdragon_multi_joint/qtdragon_yyxz.ini
@@ -43,7 +43,7 @@ DEFAULT_LINEAR_VELOCITY = 50.0
 # incremental jog step length options
 INCREMENTS = 10 mm, 1.0 mm, 0.10 mm, 0.01 mm, 1.0 inch, 0.1 inch, 0.01 inch
 
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 INTRO_GRAPHIC = silver_dragon.png
 INTRO_TIME = 2
 
diff --git a/configs/sim/qtdragon/qtdragon_tool_probe/qtdragon_auto_tool_probe.ini b/configs/sim/qtdragon/qtdragon_tool_probe/qtdragon_auto_tool_probe.ini
index cd8c1cd4ae7..70844e7f20b 100644
--- a/configs/sim/qtdragon/qtdragon_tool_probe/qtdragon_auto_tool_probe.ini
+++ b/configs/sim/qtdragon/qtdragon_tool_probe/qtdragon_auto_tool_probe.ini
@@ -48,7 +48,7 @@ INCREMENTS = 10 mm, 1.0 mm, 0.10 mm, 0.01 mm, 1.0 inch, 0.1 inch, 0.01 inch
 # Display grid increments
 GRIDS = 0, .1 mm, 1 mm, 2 mm, 5 mm, 10 mm, .25 in, .5 in
 
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 INTRO_GRAPHIC = silver_dragon.png
 INTRO_TIME = 2
 
diff --git a/configs/sim/qtdragon/qtdragon_xyz/qtdragon_inch.ini b/configs/sim/qtdragon/qtdragon_xyz/qtdragon_inch.ini
index 4be20c9b004..83eccf6aebe 100644
--- a/configs/sim/qtdragon/qtdragon_xyz/qtdragon_inch.ini
+++ b/configs/sim/qtdragon/qtdragon_xyz/qtdragon_inch.ini
@@ -46,7 +46,7 @@ INCREMENTS = 10 mm, 1.0 mm, 0.10 mm, 0.01 mm, 1.0 inch, 0.1 inch, 0.01 inch
 # Display grid increments
 GRIDS = 0, .1 mm, 1 mm, 2 mm, 5 mm, 10 mm, .25 in, .5 in
 
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 INTRO_GRAPHIC = silver_dragon.png
 INTRO_TIME = 2
 
diff --git a/configs/sim/qtdragon/qtdragon_xyz/qtdragon_metric.ini b/configs/sim/qtdragon/qtdragon_xyz/qtdragon_metric.ini
index c246e1d6845..7c1bf4d7612 100644
--- a/configs/sim/qtdragon/qtdragon_xyz/qtdragon_metric.ini
+++ b/configs/sim/qtdragon/qtdragon_xyz/qtdragon_metric.ini
@@ -46,7 +46,7 @@ INCREMENTS = 10 mm, 1.0 mm, 0.10 mm, 0.01 mm, 1.0 inch, 0.1 inch, 0.01 inch
 # Display grid increments
 GRIDS = 0, .1 mm, 1 mm, 2 mm, 5 mm, 10 mm, .25 in, .5 in
 
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 INTRO_GRAPHIC = silver_dragon.png
 INTRO_TIME = 2
 
diff --git a/configs/sim/qtdragon/qtdragon_xyz/qtdragon_metric_debug.ini b/configs/sim/qtdragon/qtdragon_xyz/qtdragon_metric_debug.ini
index b2bb0b8ddd2..d57b371d4ef 100644
--- a/configs/sim/qtdragon/qtdragon_xyz/qtdragon_metric_debug.ini
+++ b/configs/sim/qtdragon/qtdragon_xyz/qtdragon_metric_debug.ini
@@ -46,7 +46,7 @@ INCREMENTS = 10 mm, 1.0 mm, 0.10 mm, 0.01 mm, 1.0 inch, 0.1 inch, 0.01 inch
 # Display grid increments
 GRIDS = 0, .1 mm, 1 mm, 2 mm, 5 mm, 10 mm, .25 in, .5 in
 
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 INTRO_GRAPHIC = silver_dragon.png
 INTRO_TIME = 2
 
diff --git a/configs/sim/qtdragon/qtdragon_xyz/qtdragon_xyza.ini b/configs/sim/qtdragon/qtdragon_xyz/qtdragon_xyza.ini
index 466f0e98085..4001459e73e 100644
--- a/configs/sim/qtdragon/qtdragon_xyz/qtdragon_xyza.ini
+++ b/configs/sim/qtdragon/qtdragon_xyz/qtdragon_xyza.ini
@@ -51,7 +51,7 @@ ANGULAR_INCREMENTS = 0.1 deg, 1 deg, 10 deg, 22.5 deg, 30 deg, 45 deg, 90 deg
 # Display grid increments
 GRIDS = 0, .1 mm, 1 mm, 2 mm, 5 mm, 10 mm, .25 in, .5 in
 
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 INTRO_GRAPHIC = silver_dragon.png
 INTRO_TIME = 2
 
diff --git a/configs/sim/qtdragon/qtdragon_xyz45/qtdragon_xyza.ini b/configs/sim/qtdragon/qtdragon_xyz45/qtdragon_xyza.ini
index 59e43f1cb63..803ef74a639 100644
--- a/configs/sim/qtdragon/qtdragon_xyz45/qtdragon_xyza.ini
+++ b/configs/sim/qtdragon/qtdragon_xyz45/qtdragon_xyza.ini
@@ -47,7 +47,7 @@ MAX_ANGULAR_VELOCITY = 360
 # incremental jog step length options
 INCREMENTS = 10 mm, 1.0 mm, 0.10 mm, 0.01 mm, 1.0 inch, 0.1 inch, 0.01 inch
 
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 INTRO_GRAPHIC = silver_dragon.png
 INTRO_TIME = 2
 
diff --git a/configs/sim/qtdragon/qtdragon_xyz45/qtdragon_xyzab.ini b/configs/sim/qtdragon/qtdragon_xyz45/qtdragon_xyzab.ini
index 41dbf6364b5..fd1a3f8d3ec 100644
--- a/configs/sim/qtdragon/qtdragon_xyz45/qtdragon_xyzab.ini
+++ b/configs/sim/qtdragon/qtdragon_xyz45/qtdragon_xyzab.ini
@@ -47,7 +47,7 @@ MAX_ANGULAR_VELOCITY = 360
 # incremental jog step length options
 INCREMENTS = 10 mm, 1.0 mm, 0.10 mm, 0.01 mm, 1.0 inch, 0.1 inch, 0.01 inch
 
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 INTRO_GRAPHIC = silver_dragon.png
 INTRO_TIME = 2
 
diff --git a/configs/sim/qtdragon/qtdragon_xyz45/qtdragon_xyzac.ini b/configs/sim/qtdragon/qtdragon_xyz45/qtdragon_xyzac.ini
index 01fc99beefe..a36eca0591d 100644
--- a/configs/sim/qtdragon/qtdragon_xyz45/qtdragon_xyzac.ini
+++ b/configs/sim/qtdragon/qtdragon_xyz45/qtdragon_xyzac.ini
@@ -47,7 +47,7 @@ MAX_ANGULAR_VELOCITY = 360
 # incremental jog step length options
 INCREMENTS = 10 mm, 1.0 mm, 0.10 mm, 0.01 mm, 1.0 inch, 0.1 inch, 0.01 inch
 
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 INTRO_GRAPHIC = silver_dragon.png
 INTRO_TIME = 2
 
diff --git a/configs/sim/qtdragon_hd/qtdragon_hd_xyz/qtdragon_hd_vertical.ini b/configs/sim/qtdragon_hd/qtdragon_hd_xyz/qtdragon_hd_vertical.ini
index 605f9700ce1..4155051b119 100644
--- a/configs/sim/qtdragon_hd/qtdragon_hd_xyz/qtdragon_hd_vertical.ini
+++ b/configs/sim/qtdragon_hd/qtdragon_hd_xyz/qtdragon_hd_vertical.ini
@@ -49,7 +49,7 @@ INCREMENTS = 10 mm, 1.0 mm, 0.10 mm, 0.01 mm, 1.0 inch, 0.1 inch, 0.01 inch
 # Display grid increments
 GRIDS = 0, .1 mm, 1 mm, 2 mm, 5 mm, 10 mm, .25 in, .5 in
 
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 INTRO_GRAPHIC = silver_dragon.png
 INTRO_TIME = 2
 
diff --git a/configs/sim/qtdragon_hd/qtdragon_hd_xyz/qtdragon_hd_vertical_xyza.ini b/configs/sim/qtdragon_hd/qtdragon_hd_xyz/qtdragon_hd_vertical_xyza.ini
index d8e88f3b704..9db772bcd4e 100644
--- a/configs/sim/qtdragon_hd/qtdragon_hd_xyz/qtdragon_hd_vertical_xyza.ini
+++ b/configs/sim/qtdragon_hd/qtdragon_hd_xyz/qtdragon_hd_vertical_xyza.ini
@@ -53,7 +53,7 @@ INCREMENTS = 10 mm, 1.0 mm, 0.10 mm, 0.01 mm, 1.0 inch, 0.1 inch, 0.01 inch
 # Display grid increments
 GRIDS = 0, .1 mm, 1 mm, 2 mm, 5 mm, 10 mm, .25 in, .5 in
 
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 INTRO_GRAPHIC = silver_dragon.png
 INTRO_TIME = 2
 
diff --git a/configs/sim/qtdragon_hd/qtdragon_hd_xyz/qtdragon_hd_xyz.ini b/configs/sim/qtdragon_hd/qtdragon_hd_xyz/qtdragon_hd_xyz.ini
index 25283374243..e0f6067a822 100644
--- a/configs/sim/qtdragon_hd/qtdragon_hd_xyz/qtdragon_hd_xyz.ini
+++ b/configs/sim/qtdragon_hd/qtdragon_hd_xyz/qtdragon_hd_xyz.ini
@@ -49,7 +49,7 @@ INCREMENTS = 10 mm, 1.0 mm, 0.10 mm, 0.01 mm, 1.0 inch, 0.1 inch, 0.01 inch
 # Display grid increments
 GRIDS = 0, .1 mm, 1 mm, 2 mm, 5 mm, 10 mm, .25 in, .5 in
 
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 INTRO_GRAPHIC = silver_dragon.png
 INTRO_TIME = 2
 
diff --git a/configs/sim/qtdragon_hd/qtdragon_hd_xyz/qtdragon_hd_xyza.ini b/configs/sim/qtdragon_hd/qtdragon_hd_xyz/qtdragon_hd_xyza.ini
index b206ed1a7db..677819c2de4 100644
--- a/configs/sim/qtdragon_hd/qtdragon_hd_xyz/qtdragon_hd_xyza.ini
+++ b/configs/sim/qtdragon_hd/qtdragon_hd_xyz/qtdragon_hd_xyza.ini
@@ -50,7 +50,7 @@ INCREMENTS = 10 mm, 1.0 mm, 0.10 mm, 0.01 mm, 1.0 inch, 0.1 inch, 0.01 inch
 # Display grid increments
 GRIDS = 0, .1 mm, 1 mm, 2 mm, 5 mm, 10 mm, .25 in, .5 in
 
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 INTRO_GRAPHIC = silver_dragon.png
 INTRO_TIME = 2
 
diff --git a/configs/sim/qtdragon_hd/qtdragon_hd_xyz/qtdragon_hd_xyzab.ini b/configs/sim/qtdragon_hd/qtdragon_hd_xyz/qtdragon_hd_xyzab.ini
index a489db176c6..422049a2c41 100644
--- a/configs/sim/qtdragon_hd/qtdragon_hd_xyz/qtdragon_hd_xyzab.ini
+++ b/configs/sim/qtdragon_hd/qtdragon_hd_xyz/qtdragon_hd_xyzab.ini
@@ -47,7 +47,7 @@ MAX_ANGULAR_VELOCITY = 360
 # incremental jog step length options
 INCREMENTS = 10 mm, 1.0 mm, 0.10 mm, 0.01 mm, 1.0 inch, 0.1 inch, 0.01 inch
 
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 INTRO_GRAPHIC = silver_dragon.png
 INTRO_TIME = 2
 
diff --git a/configs/sim/qtdragon_hd/qtdragon_hd_xyz/qtdragon_hd_xyzac.ini b/configs/sim/qtdragon_hd/qtdragon_hd_xyz/qtdragon_hd_xyzac.ini
index 2d2c97b1e17..aec578684a6 100644
--- a/configs/sim/qtdragon_hd/qtdragon_hd_xyz/qtdragon_hd_xyzac.ini
+++ b/configs/sim/qtdragon_hd/qtdragon_hd_xyz/qtdragon_hd_xyzac.ini
@@ -47,7 +47,7 @@ MAX_ANGULAR_VELOCITY = 360
 # incremental jog step length options
 INCREMENTS = 10 mm, 1.0 mm, 0.10 mm, 0.01 mm, 1.0 inch, 0.1 inch, 0.01 inch
 
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 INTRO_GRAPHIC = silver_dragon.png
 INTRO_TIME = 2
 
diff --git a/configs/sim/qtdragon_hd/qtdragon_hd_xyz/qtdragon_next_xyz.ini b/configs/sim/qtdragon_hd/qtdragon_hd_xyz/qtdragon_next_xyz.ini
index aaf67603a23..4e6fc2c6125 100644
--- a/configs/sim/qtdragon_hd/qtdragon_hd_xyz/qtdragon_next_xyz.ini
+++ b/configs/sim/qtdragon_hd/qtdragon_hd_xyz/qtdragon_next_xyz.ini
@@ -43,7 +43,7 @@ DEFAULT_LINEAR_VELOCITY = 50.0
 # incremental jog step length options
 INCREMENTS = 10 mm, 1.0 mm, 0.10 mm, 0.01 mm, 1.0 inch, 0.1 inch, 0.01 inch
 
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 INTRO_GRAPHIC = silver_dragon.png
 INTRO_TIME = 2
 
diff --git a/configs/sim/qtdragon_hd/qtdragon_hd_z_compensation/qtdragon_hd_z_compensation.ini b/configs/sim/qtdragon_hd/qtdragon_hd_z_compensation/qtdragon_hd_z_compensation.ini
index 274443940af..a5d62164956 100644
--- a/configs/sim/qtdragon_hd/qtdragon_hd_z_compensation/qtdragon_hd_z_compensation.ini
+++ b/configs/sim/qtdragon_hd/qtdragon_hd_z_compensation/qtdragon_hd_z_compensation.ini
@@ -43,7 +43,7 @@ DEFAULT_LINEAR_VELOCITY = 50.0
 # incremental jog step length options
 INCREMENTS = 10 mm, 1.0 mm, 0.10 mm, 0.01 mm, 1.0 inch, 0.1 inch, 0.01 inch
 
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 INTRO_GRAPHIC = silver_dragon.png
 INTRO_TIME = 2
 
diff --git a/configs/sim/qtvcp_screens/non-trivial/scara/scara.ini b/configs/sim/qtvcp_screens/non-trivial/scara/scara.ini
index 97f588c2e34..9856cf54e46 100644
--- a/configs/sim/qtvcp_screens/non-trivial/scara/scara.ini
+++ b/configs/sim/qtvcp_screens/non-trivial/scara/scara.ini
@@ -42,7 +42,7 @@ DEFAULT_LINEAR_VELOCITY = 50.0
 # incremental jog step length options
 INCREMENTS = 10 mm, 1.0 mm, 0.10 mm, 0.01 mm, 1.0 inch, 0.1 inch, 0.01 inch
 
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 INTRO_GRAPHIC = silver_dragon.png
 INTRO_TIME = 2
 
diff --git a/configs/sim/qtvcp_screens/qtdragon/qtdragon_mpg.ini b/configs/sim/qtvcp_screens/qtdragon/qtdragon_mpg.ini
index a28b0a1e885..9ac966639f9 100644
--- a/configs/sim/qtvcp_screens/qtdragon/qtdragon_mpg.ini
+++ b/configs/sim/qtvcp_screens/qtdragon/qtdragon_mpg.ini
@@ -27,7 +27,7 @@ DEFAULT_LINEAR_JOG_VEL  = 50.0
 DEFAULT_ANGULAR_VELOCITY = 0
 MIN_ANGULAR_VELOCITY = 0
 MAX_ANGULAR_VELOCITY = 0
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 INTRO_GRAPHIC = linuxcnc.gif
 INTRO_TIME = 2
 PROGRAM_PREFIX = ~/linuxcnc/nc_files
diff --git a/configs/sim/woodpecker/woodpecker.ini b/configs/sim/woodpecker/woodpecker.ini
index fc6b389dc99..b2a69f96b05 100644
--- a/configs/sim/woodpecker/woodpecker.ini
+++ b/configs/sim/woodpecker/woodpecker.ini
@@ -26,7 +26,7 @@ DEFAULT_LINEAR_JOG_VEL  = 50.0
 DEFAULT_ANGULAR_VELOCITY = 0
 MIN_ANGULAR_VELOCITY = 0
 MAX_ANGULAR_VELOCITY = 0
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 INTRO_GRAPHIC = linuxcnc.gif
 INTRO_TIME = 2
 PROGRAM_PREFIX =  ~/linuxcnc/nc_files
diff --git a/configs/sim/woodpecker/woodpecker_auto_tool_probe.ini b/configs/sim/woodpecker/woodpecker_auto_tool_probe.ini
index e8fe3935119..cca4c3747bd 100644
--- a/configs/sim/woodpecker/woodpecker_auto_tool_probe.ini
+++ b/configs/sim/woodpecker/woodpecker_auto_tool_probe.ini
@@ -28,7 +28,7 @@ DEFAULT_LINEAR_JOG_VEL  = 50.0
 DEFAULT_ANGULAR_VELOCITY = 0
 MIN_ANGULAR_VELOCITY = 0
 MAX_ANGULAR_VELOCITY = 0
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 INTRO_GRAPHIC = linuxcnc.gif
 INTRO_TIME = 2
 PROGRAM_PREFIX = ~/linuxcnc/nc_files
diff --git a/configs/sim/woodpecker/woodpecker_xyz.ini b/configs/sim/woodpecker/woodpecker_xyz.ini
index 911f2c576b0..a1ab67d0140 100644
--- a/configs/sim/woodpecker/woodpecker_xyz.ini
+++ b/configs/sim/woodpecker/woodpecker_xyz.ini
@@ -30,7 +30,7 @@ DEFAULT_LINEAR_JOG_VEL  = 50.0
 MIN_ANGULAR_VELOCITY = 0
 MAX_ANGULAR_VELOCITY = 60
 DEFAULT_ANGULAR_VELOCITY = 30
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 INTRO_GRAPHIC = linuxcnc.gif
 INTRO_TIME = 2
 PROGRAM_PREFIX = ~/linuxcnc/nc_files
diff --git a/configs/sim/woodpecker/woodpecker_xyza.ini b/configs/sim/woodpecker/woodpecker_xyza.ini
index 1226c5e7e00..c4a3a2765fe 100644
--- a/configs/sim/woodpecker/woodpecker_xyza.ini
+++ b/configs/sim/woodpecker/woodpecker_xyza.ini
@@ -31,7 +31,7 @@ DEFAULT_LINEAR_JOG_VEL  = 50.0
 MIN_ANGULAR_VELOCITY = 0
 MAX_ANGULAR_VELOCITY = 60
 DEFAULT_ANGULAR_VELOCITY = 30
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 INTRO_GRAPHIC = linuxcnc.gif
 INTRO_TIME = 2
 PROGRAM_PREFIX = ~/linuxcnc/nc_files
diff --git a/configs/sim/woodpecker/woodpecker_xyzab.ini b/configs/sim/woodpecker/woodpecker_xyzab.ini
index d6229b133c6..94f47afdc0e 100644
--- a/configs/sim/woodpecker/woodpecker_xyzab.ini
+++ b/configs/sim/woodpecker/woodpecker_xyzab.ini
@@ -36,7 +36,7 @@ NGCGUI_SUBFILE_PATH =  /home/.../linuxcnc/nc_files/ngcgui_lib/
 # specify filenames only, files must be in the NGCGUI_SUBFILE_PATH
 NGCGUI_SUBFILE = slot.ngc
 NGCGUI_SUBFILE = qpocket.ngc
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 INTRO_GRAPHIC = linuxcnc.gif
 INTRO_TIME = 2
 PROGRAM_PREFIX = ~/linuxcnc/nc_files
diff --git a/configs/sim/woodpecker/woodpecker_xyzy.ini b/configs/sim/woodpecker/woodpecker_xyzy.ini
index 18f793993f4..89f69995419 100644
--- a/configs/sim/woodpecker/woodpecker_xyzy.ini
+++ b/configs/sim/woodpecker/woodpecker_xyzy.ini
@@ -29,7 +29,7 @@ DEFAULT_LINEAR_JOG_VEL  = 50.0
 MIN_ANGULAR_VELOCITY = 0
 MAX_ANGULAR_VELOCITY = 60
 DEFAULT_ANGULAR_VELOCITY = 30
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 INTRO_GRAPHIC = linuxcnc.gif
 INTRO_TIME = 2
 PROGRAM_PREFIX = ~/linuxcnc/nc_files
diff --git a/configs/sim/woodpecker/woodpecker_xyzya.ini b/configs/sim/woodpecker/woodpecker_xyzya.ini
index 3f0ba0c3b57..e133abe5bc0 100644
--- a/configs/sim/woodpecker/woodpecker_xyzya.ini
+++ b/configs/sim/woodpecker/woodpecker_xyzya.ini
@@ -32,7 +32,7 @@ DEFAULT_LINEAR_JOG_VEL  = 50.0
 MIN_ANGULAR_VELOCITY = 0
 MAX_ANGULAR_VELOCITY = 60
 DEFAULT_ANGULAR_VELOCITY = 30
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 INTRO_GRAPHIC = linuxcnc.gif
 INTRO_TIME = 2
 PROGRAM_PREFIX = ~/linuxcnc/nc_files
diff --git a/docs/src/config/ini-config.adoc b/docs/src/config/ini-config.adoc
index 4980de30b1d..0ad3317d03e 100644
--- a/docs/src/config/ini-config.adoc
+++ b/docs/src/config/ini-config.adoc
@@ -356,11 +356,12 @@ Descriptions of the interfaces are in the Interfaces section of the User Manual.
   The `PROGRAM_PREFIX` directory is searched before the directories listed in `[RS274]SUBROUTINE_PATH` and `[RS274]USER_M_PATH`.
 * `INTRO_GRAPHIC = emc2.gif` - The image shown on the splash screen.
 * `INTRO_TIME = 5` - The maximum time to show the splash screen, in seconds.
-* `CYCLE_TIME = 100` - Cycle time of the display GUI.
-  Depending on the screen, this can be in seconds or ms (ms preferred).
-  This is often the update rate rather then sleep time between updates.
+* `CYCLE_TIME = 0.100` - Cycle time of the display GUI, in seconds.
+  A value from 0.001 up to but not including 1.0 is in seconds; a value of 1.0 or more is read as milliseconds, so `100` also means 0.1 s.
+  Any other value (zero, negative or not a number) gives a warning and the GUI uses 0.150 s, as it does when the setting is missing.
+  This is often the update rate rather than sleep time between updates.
   If the update time is not set right the screen can become unresponsive or very jerky.
-  A value of 100 ms (0.1 s) is a common setting though a range of 50 - 200 ms (.05 - .2 s) may be useable.
+  A value of 0.1 s is a common setting though a range of 0.05 - 0.2 s may be useable.
   An under powered CPU may see improvement with a longer setting.
   Usually the default is fine.
 * `PREVIEW_TIMEOUT = 5` - Timeout (in seconds) for loading graphical preview of G-code. Currently AXIS only.
diff --git a/docs/src/gui/axis.adoc b/docs/src/gui/axis.adoc
index caa94c9d104..341ea500526 100644
--- a/docs/src/gui/axis.adoc
+++ b/docs/src/gui/axis.adoc
@@ -34,15 +34,14 @@ works see the <<sub:ini:sec:display,Display Section>> and the
 <<sub:ini:sec:axis-letter,Axis Section>> of the INI
 Configuration Chapter.
 
-* 'CYCLE_TIME' - Adjust the response rate of the GUI in
-  milliseconds. Typical 100, useable range 50 - 200 +
-  (will accept time in seconds (.05 -.2) for legacy reasons -
-  milliseconds preferred to match other screens).
+* 'CYCLE_TIME' - Adjust the response rate of the GUI, in seconds.
+  Typical 0.1, useable range 0.05 - 0.2, default 0.15.
+  A value of 1.0 or more is read as milliseconds.
 
 [source,ini]
 ----
 [DISPLAY]
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 ----
 
 * 'PREVIEW_TIMEOUT' - Set timeout in seconds for loading G-code preview.
diff --git a/docs/src/gui/gui-dev-reference.adoc b/docs/src/gui/gui-dev-reference.adoc
index f126756f2dc..1ba52f6ee20 100644
--- a/docs/src/gui/gui-dev-reference.adoc
+++ b/docs/src/gui/gui-dev-reference.adoc
@@ -52,13 +52,15 @@ ICON = silver_dragon.png
 
 ==== Cycle Time
 If settable, this is how to set the cycle time of the display GUI. +
-This is often the update rate rather then sleep time between updates. +
-A value of 100 ms (0.1 s) is a common setting though a range of 50 - 200 ms is not unheard of.
+This is often the update rate rather than sleep time between updates. +
+The value is in seconds: 0.1 s is a common setting though a range of 0.05 - 0.2 s is not unheard of. +
+A value from 0.001 up to but not including 1.0 is in seconds; a value of 1.0 or more is read as milliseconds. +
+Python screens read it with `display_cycle_time()` from `common.cycle_time`, which returns milliseconds and reports invalid values.
 
 [source,ini]
 ----
 [DISPLAY]
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 ----
 
 ==== File Paths
diff --git a/docs/src/gui/qtvcp.adoc b/docs/src/gui/qtvcp.adoc
index c280f369bc4..428ca9ffe8e 100644
--- a/docs/src/gui/qtvcp.adoc
+++ b/docs/src/gui/qtvcp.adoc
@@ -124,13 +124,14 @@ QtVCP will first search the LinuxCNC configuration directory that was launched f
 [source,ini]
 ----
 [DISPLAY]
-CYCLE_TIME = 100
+CYCLE_TIME = 0.100
 GRAPHICS_CYCLE_TIME = 100
-HALPIN_CYCLE = 100
+HALPIN_CYCLE_TIME = 100
 ----
 
-Adjusts the response rate of the GUI updates in milliseconds.
-Defaults to 100, useable range 50 - 200.
+Adjusts the response rate of the GUI updates, useable range 0.05 - 0.2 s.
+`CYCLE_TIME` is in seconds, default 0.15; a value of 1.0 or more is read as milliseconds.
+`GRAPHICS_CYCLE_TIME` and `HALPIN_CYCLE_TIME` are in milliseconds, default 100.
 
 The widgets, graphics and HAL pin update can be set separately.
 
diff --git a/lib/python/common/cycle_time.py b/lib/python/common/cycle_time.py
new file mode 100644
index 00000000000..822d4748e3f
--- /dev/null
+++ b/lib/python/common/cycle_time.py
@@ -0,0 +1,61 @@
+#!/usr/bin/env python3
+# vim: sts=4 sw=4 et
+"""
+[DISPLAY]CYCLE_TIME handling shared by the GUIs and VCPs.
+
+The value is in seconds: from 0.001 up to but not including 1.0. A value
+of 1.0 or more is read as milliseconds. Anything else (zero, negative,
+non-numeric) is reported and replaced by the default of 0.150 s. A
+missing value silently uses the default.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+"""
+
+import math
+import sys
+
+DEFAULT_MS = 150
+
+_reported = set()
+
+
+def parse_cycle_time(value):
+    """Convert a raw [DISPLAY]CYCLE_TIME string to milliseconds.
+
+    Returns (milliseconds, message). message is None unless the value
+    is present but invalid, in which case milliseconds is DEFAULT_MS.
+    """
+    if value is None:
+        return DEFAULT_MS, None
+    try:
+        t = float(value)
+    except (TypeError, ValueError):
+        t = math.nan
+    if math.isfinite(t):
+        if 0.001 <= t < 1.0:
+            return int(math.floor(t * 1000.0 + 0.5)), None
+        if t >= 1.0:
+            return int(math.floor(t + 0.5)), None
+    return DEFAULT_MS, ("[DISPLAY]CYCLE_TIME = {} is invalid, expected seconds "
+                        "(0.001 to below 1.0) or milliseconds (1 or more): "
+                        "using {:.3f} s".format(value, DEFAULT_MS / 1000.0))
+
+
+def display_cycle_time(inifile, warn=None):
+    """Read [DISPLAY]CYCLE_TIME from a linuxcnc.ini object, in milliseconds.
+
+    warn is called with the message for an invalid value. Without warn
+    the message goes to stderr, unless another reader in the same process
+    already reported it.
+    """
+    ms, message = parse_cycle_time(inifile.find("DISPLAY", "CYCLE_TIME"))
+    if message:
+        if warn is not None:
+            warn(message)
+        elif message not in _reported:
+            print(message, file=sys.stderr)
+        _reported.add(message)
+    return ms
diff --git a/lib/python/common/hal_glib.py b/lib/python/common/hal_glib.py
index 6227a3dae3b..23f714f2b37 100644
--- a/lib/python/common/hal_glib.py
+++ b/lib/python/common/hal_glib.py
@@ -12,6 +12,7 @@
 
 # Set up logging
 from . import logger
+from .cycle_time import display_cycle_time, DEFAULT_MS
 # log instance holder variable
 LOG = None
 
@@ -38,15 +39,10 @@
 except:
     pass
 try:
-    # get cycle time which could be in ms or seconds
-    # convert to ms - use this to set update time
-    ct = inifile.getreal('DISPLAY', 'CYCLE_TIME', fallback=100)
-    if ct < 1:
-        CYCLE_TIME = int(ct * 1000)
-    else:
-        CYCLE_TIME = int(ct)
+    # update time in ms, see common/cycle_time.py for the units
+    CYCLE_TIME = display_cycle_time(inifile)
 except:
-    CYCLE_TIME = 100
+    CYCLE_TIME = DEFAULT_MS
 
 class GPin(GObject.Object, hal.Pin):
     __gtype_name__ = 'GPin'
diff --git a/lib/python/common/iniinfo.py b/lib/python/common/iniinfo.py
index 2f429affe6b..d1e969681e4 100644
--- a/lib/python/common/iniinfo.py
+++ b/lib/python/common/iniinfo.py
@@ -5,6 +5,7 @@
 
 # Set up logging
 from . import logger
+from .cycle_time import display_cycle_time
 
 # log instance holder variable
 LOG = None
@@ -57,13 +58,9 @@ def __init__(self, ini=None):
         self.update()
 
     def update(self):
-        ct = self.INI.getreal('DISPLAY', 'CYCLE_TIME', fallback=100) # possibly in seconds or ms
-        if ct < 1:
-            self.CYCLE_TIME = int(ct * 1000)
-        else:
-            self.CYCLE_TIME = int(ct)
-        self.GRAPHICS_CYCLE_TIME = self.INI.getint('DISPLAY', 'GRAPHICS_CYCLE_TIME', fallback=100) # in seconds
-        self.HALPIN_CYCLE_TIME = self.INI.getint('DISPLAY', 'HALPIN_CYCLE_TIME', fallback=100) # in seconds
+        self.CYCLE_TIME = display_cycle_time(self.INI, LOG.warning) # in ms
+        self.GRAPHICS_CYCLE_TIME = self.INI.getint('DISPLAY', 'GRAPHICS_CYCLE_TIME', fallback=100) # in ms
+        self.HALPIN_CYCLE_TIME = self.INI.getint('DISPLAY', 'HALPIN_CYCLE_TIME', fallback=100) # in ms
         self.MDI_HISTORY_PATH = self.INI.getstring('DISPLAY', 'MDI_HISTORY_FILE', fallback='~/.axis_mdi_history')
         self.QTVCP_LOG_HISTORY_PATH = self.INI.getstring('DISPLAY', 'LOG_FILE', fallback='~/qtvcp.log')
         self.MACHINE_LOG_HISTORY_PATH = self.INI.getstring('DISPLAY', 'MACHINE_LOG_PATH', fallback='~/.machine_log_history')
diff --git a/src/emc/usr_intf/axis/scripts/axis.py b/src/emc/usr_intf/axis/scripts/axis.py
index 9477cca0332..58c7d3d770a 100755
--- a/src/emc/usr_intf/axis/scripts/axis.py
+++ b/src/emc/usr_intf/axis/scripts/axis.py
@@ -72,6 +72,7 @@ def tkerror(self, arg):
 import bwidget
 from math import hypot, atan2, sin, cos, pi, sqrt
 import linuxcnc
+from common.cycle_time import display_cycle_time
 from glnav import *
 
 if "AXIS_NO_HAL" in os.environ:
@@ -3660,11 +3661,7 @@ def bind_axis(a, b, d):
          homing_order_defined = 0
          break
 
-ct = inifile.getreal('DISPLAY', 'CYCLE_TIME', fallback=.020)
-if ct < 1:
-    update_ms = int(ct * 1000)
-else:
-    update_ms = int(ct)
+update_ms = display_cycle_time(inifile)
 interpname = inifile.getstring("TASK", "INTERPRETER", fallback="")
 
 s = linuxcnc.stat();
diff --git a/src/emc/usr_intf/gmoccapy/getiniinfo.py b/src/emc/usr_intf/gmoccapy/getiniinfo.py
index 7bae0da9975..ab71eca9c70 100644
--- a/src/emc/usr_intf/gmoccapy/getiniinfo.py
+++ b/src/emc/usr_intf/gmoccapy/getiniinfo.py
@@ -30,6 +30,7 @@
 
 # Set up logging
 from common import logger
+from common.cycle_time import display_cycle_time
 
 LOG = logger.getLogger(__name__)
 # Force the log level for this module
@@ -47,20 +48,7 @@ def __init__(self):
             sys.exit()
 
     def get_cycle_time(self):
-        temp = self.inifile.getreal("DISPLAY", "CYCLE_TIME")
-        if temp is not None:
-            # Can be in seconds or milliseconds and, regardless,
-            # the result must be larger than zero to be valid.
-            # This brings gmoccapy in line with f.ex. AXIS.
-            if temp >= 0.001 and temp < 1.0:
-                return int(temp * 1000.0) # Assume seconds
-            elif temp >= 1.0:
-                return int(temp) # Assume milliseconds
-        # Otherwise, undefined or less or equal to zero
-        message = ("Wrong entry [DISPLAY] CYCLE_TIME in INI File! ")
-        message += ("Will use gmoccapy default 150")
-        LOG.warning(message)
-        return 150
+        return display_cycle_time(self.inifile, LOG.warning)
 
     def get_postgui_halfile(self):
         postgui_halfile = self.inifile.findall("HAL", "POSTGUI_HALFILE") or None
diff --git a/src/emc/usr_intf/gscreen/gscreen.py b/src/emc/usr_intf/gscreen/gscreen.py
index 6a89904ca69..f82df55baf9 100755
--- a/src/emc/usr_intf/gscreen/gscreen.py
+++ b/src/emc/usr_intf/gscreen/gscreen.py
@@ -196,6 +196,7 @@ def _print_help():
     pass
 import linuxcnc
 import axis_kinds
+from common.cycle_time import display_cycle_time
 from gscreen import emc_interface
 from gscreen import mdi
 from gscreen import preferences
@@ -855,13 +856,10 @@ def __init__(self):
         self.halcomp.ready()
 
         # timers for display updates
-        temp = self.inifile.getreal("DISPLAY","CYCLE_TIME")
-        if not temp:
-            self.add_alarm_entry(_("CYCLE_TIME in [DISPLAY] of INI file is missing: defaulting to 100ms"))
-            temp = 100
-        elif temp < 50:
-            self.add_alarm_entry(_("CYCLE_TIME in [DISPLAY] of INI file is too small: defaulting to 100ms"))
-            temp = 100
+        def cycle_time_warning(message):
+            LOG.warning(message)
+            self.add_alarm_entry(message)
+        temp = display_cycle_time(self.inifile, cycle_time_warning)
         #print(_("timeout %d" % int(temp)))
         if "timer_interrupt" in dir(self.handler_instance):
             GLib.timeout_add(int(temp), self.handler_instance.timer_interrupt)
diff --git a/src/emc/usr_intf/pncconf/build_INI.py b/src/emc/usr_intf/pncconf/build_INI.py
index 379978a4cff..0df0b969672 100644
--- a/src/emc/usr_intf/pncconf/build_INI.py
+++ b/src/emc/usr_intf/pncconf/build_INI.py
@@ -134,7 +134,7 @@ def write_inifile(self, base):
         if self.d.frontend != _PD._QTPLASMAC:
             print("EDITOR = %s"% self.d.editor, file=file)
         print("GEOMETRY = %s"% self.d.geometry, file=file)
-        print("CYCLE_TIME = 100", file=file)
+        print("CYCLE_TIME = 0.100", file=file)
 
         # set up MDI macro buttons
         if self.d.frontend == _PD._QTDRAGON:
diff --git a/tcl/tklinuxcnc.tcl b/tcl/tklinuxcnc.tcl
index d35db338406..6c0f89981ac 100755
--- a/tcl/tklinuxcnc.tcl
+++ b/tcl/tklinuxcnc.tcl
@@ -107,12 +107,19 @@ for {set idx 0} {$idx < $::MAX_JOINTS} {incr idx} {
    set jointlabel$idx "$idx"
 }
 
-# set the cycle time for display updating
+# set the cycle time for display updating, in ms
+# the INI value is seconds, 0.001 to below 1.0; 1 or more is read as ms
+set displayCycleTime 150
 set temp [emc_ini "CYCLE_TIME" "DISPLAY"]
-if {[string length $temp] == 0} {
-    set temp 0.200
+if {[string length $temp] != 0} {
+    if {[string is double -strict $temp] && $temp >= 0.001 && $temp < 1.0} {
+        set displayCycleTime [expr {round($temp * 1000)}]
+    } elseif {[string is double -strict $temp] && $temp >= 1.0 && $temp < Inf} {
+        set displayCycleTime [expr {round($temp)}]
+    } else {
+        puts stderr "$::prog: \[DISPLAY\]CYCLE_TIME = $temp is invalid, expected seconds (0.001 to below 1.0) or milliseconds (1 or more): using 0.150 s"
+    }
 }
-set displayCycleTime [expr {int($temp * 1000 + 0.5)}]
 set syncDelayTime    $displayCycleTime ;#increasing improves slider behavior
 
 # set the debounce time for key repeats
diff --git a/tests/display-cycle-time/expected b/tests/display-cycle-time/expected
new file mode 100644
index 00000000000..ac0535cdb63
--- /dev/null
+++ b/tests/display-cycle-time/expected
@@ -0,0 +1,25 @@
+None => 150 ok
+'0.0009' => 150 warning
+'0.001' => 1 ok
+'0.1' => 100 ok
+'0.5' => 500 ok
+'0.999' => 999 ok
+'1' => 1 ok
+'1.0' => 1 ok
+'100' => 100 ok
+'150.4' => 150 ok
+'-0.1' => 150 warning
+'-100' => 150 warning
+'0' => 150 warning
+'' => 150 warning
+'abc' => 150 warning
+'100ms' => 150 warning
+'nan' => 150 warning
+'inf' => 150 warning
+250
+150
+150
+callback: [DISPLAY]CYCLE_TIME = -5 is invalid, expected seconds (0.001 to below 1.0) or milliseconds (1 or more): using 0.150 s
+150 stderr: (none)
+150 stderr: [DISPLAY]CYCLE_TIME = x is invalid, expected seconds (0.001 to below 1.0) or milliseconds (1 or more): using 0.150 s
+150 stderr: (none)
diff --git a/tests/display-cycle-time/test b/tests/display-cycle-time/test
new file mode 100755
index 00000000000..088f37147d9
--- /dev/null
+++ b/tests/display-cycle-time/test
@@ -0,0 +1,39 @@
+#!/usr/bin/env python3
+# [DISPLAY]CYCLE_TIME parsing shared by the Python GUIs (issue #4424):
+# 0.001 <= value < 1.0 is seconds, value >= 1.0 is milliseconds,
+# anything else warns and uses 150 ms, as a missing value does.
+
+import contextlib
+import io
+
+from common.cycle_time import parse_cycle_time, display_cycle_time
+
+for raw in [None, "0.0009", "0.001", "0.1", "0.5", "0.999", "1", "1.0",
+            "100", "150.4", "-0.1", "-100", "0", "", "abc", "100ms",
+            "nan", "inf"]:
+    ms, message = parse_cycle_time(raw)
+    print("{!r} => {} {}".format(raw, ms, "warning" if message else "ok"))
+
+
+class FakeIni:
+    def __init__(self, value):
+        self.value = value
+
+    def find(self, section, key):
+        assert (section, key) == ("DISPLAY", "CYCLE_TIME")
+        return self.value
+
+
+warnings = []
+print(display_cycle_time(FakeIni("0.25"), warnings.append))
+print(display_cycle_time(FakeIni(None), warnings.append))
+print(display_cycle_time(FakeIni("-5"), warnings.append))
+for w in warnings:
+    print("callback:", w)
+
+# without a callback: stderr, but only if not yet reported in this process
+for value in ["-5", "x", "x"]:
+    err = io.StringIO()
+    with contextlib.redirect_stderr(err):
+        ms = display_cycle_time(FakeIni(value))
+    print(ms, "stderr:", err.getvalue().strip() or "(none)")