diff --git a/kmk/handlers/stock.py b/kmk/handlers/stock.py
index f98e4e4..ba301eb 100644
--- a/kmk/handlers/stock.py
+++ b/kmk/handlers/stock.py
@@ -1,4 +1,4 @@
-from kmk.kmktime import sleep_ms
+from time import sleep
 
 
 def passthrough(key, keyboard, *args, **kwargs):
@@ -95,7 +95,7 @@ def bkdl_released(key, keyboard, KC, *args, **kwargs):
 
 
 def sleep_pressed(key, keyboard, KC, *args, **kwargs):
-    sleep_ms(key.meta.ms)
+    sleep(key.meta.ms / 1000)
     return keyboard
 
 
diff --git a/kmk/kmk_keyboard.py b/kmk/kmk_keyboard.py
index 672dee1..7f806df 100644
--- a/kmk/kmk_keyboard.py
+++ b/kmk/kmk_keyboard.py
@@ -1,7 +1,8 @@
+from supervisor import ticks_ms
+
 from kmk.consts import KMK_RELEASE, UnicodeMode
 from kmk.hid import BLEHID, USBHID, AbstractHID, HIDModes
 from kmk.keys import KC
-from kmk.kmktime import ticks_ms
 from kmk.matrix import MatrixScanner, intify_coordinate
 from kmk.types import TapDanceKeyMeta
 
diff --git a/kmk/kmktime.py b/kmk/kmktime.py
index 18b62a8..82ed7cd 100644
--- a/kmk/kmktime.py
+++ b/kmk/kmktime.py
@@ -1,23 +1,15 @@
-import time
+from micropython import const
+
+_TICKS_PERIOD = const(1 << 29)
+_TICKS_MAX = const(_TICKS_PERIOD - 1)
+_TICKS_HALFPERIOD = const(_TICKS_PERIOD // 2)
 
 
-def sleep_ms(ms):
-    return time.sleep(ms / 1000)
+def ticks_diff(new, start):
+    diff = (new - start) & _TICKS_MAX
+    diff = ((diff + _TICKS_HALFPERIOD) & _TICKS_MAX) - _TICKS_HALFPERIOD
+    return diff
 
 
-def ticks_ms():
-    '''Has .25s granularity, but is cheap'''
-    return time.monotonic() * 1000
-
-
-def ticks_diff(new, old):
-    return new - old
-
-
-def accurate_ticks():
-    '''Is more expensive, but good for time critical things'''
-    return time.monotonic_ns()
-
-
-def accurate_ticks_diff(new, old, ms):
-    return bool(new - old < ms * 1000000)
+def check_deadline(new, start, ms):
+    return ticks_diff(new, start) < ms
diff --git a/kmk/modules/encoder.py b/kmk/modules/encoder.py
index 86c841f..a7aca5c 100644
--- a/kmk/modules/encoder.py
+++ b/kmk/modules/encoder.py
@@ -1,6 +1,6 @@
 import digitalio
+from supervisor import ticks_ms
 
-from kmk.kmktime import ticks_ms
 from kmk.modules import Module
 
 
diff --git a/kmk/modules/layers.py b/kmk/modules/layers.py
index 416bc27..1d7a281 100644
--- a/kmk/modules/layers.py
+++ b/kmk/modules/layers.py
@@ -1,9 +1,10 @@
 '''One layer isn't enough. Adds keys to get to more of them'''
 from micropython import const
+from supervisor import ticks_ms
 
 from kmk.key_validators import layer_key_validator
 from kmk.keys import make_argumented_key
-from kmk.kmktime import accurate_ticks, accurate_ticks_diff
+from kmk.kmktime import check_deadline
 from kmk.modules import Module
 
 
@@ -131,15 +132,13 @@ class Layers(Module):
 
     def _lt_pressed(self, key, keyboard, *args, **kwargs):
         # Sets the timer start and acts like MO otherwise
-        self.start_time[LayerType.LT] = accurate_ticks()
+        self.start_time[LayerType.LT] = ticks_ms()
         self._mo_pressed(key, keyboard, *args, **kwargs)
 
     def _lt_released(self, key, keyboard, *args, **kwargs):
         # On keyup, check timer, and press key if needed.
         if self.start_time[LayerType.LT] and (
-            accurate_ticks_diff(
-                accurate_ticks(), self.start_time[LayerType.LT], keyboard.tap_time
-            )
+            check_deadline(ticks_ms(), self.start_time[LayerType.LT], keyboard.tap_time)
         ):
             keyboard.hid_pending = True
             keyboard.tap_key(key.meta.kc)
@@ -171,10 +170,10 @@ class Layers(Module):
         '''
         if self.start_time[LayerType.TT] is None:
             # Sets the timer start and acts like MO otherwise
-            self.start_time[LayerType.TT] = accurate_ticks()
+            self.start_time[LayerType.TT] = ticks_ms()
             self._mo_pressed(key, keyboard, *args, **kwargs)
-        elif accurate_ticks_diff(
-            accurate_ticks(), self.start_time[LayerType.TT], keyboard.tap_time
+        elif check_deadline(
+            ticks_ms(), self.start_time[LayerType.TT], keyboard.tap_time
         ):
             self.start_time[LayerType.TT] = None
             self._tg_pressed(key, keyboard, *args, **kwargs)
@@ -182,8 +181,8 @@ class Layers(Module):
         return
 
     def _tt_released(self, key, keyboard, *args, **kwargs):
-        if self.start_time[LayerType.TT] is None or not accurate_ticks_diff(
-            accurate_ticks(), self.start_time[LayerType.TT], keyboard.tap_time
+        if self.start_time[LayerType.TT] is None or not check_deadline(
+            ticks_ms(), self.start_time[LayerType.TT], keyboard.tap_time
         ):
             # On first press, works like MO. On second press, does nothing unless let up within
             # time window, then acts like TG.
diff --git a/kmk/modules/modtap.py b/kmk/modules/modtap.py
index 5402899..76e9755 100644
--- a/kmk/modules/modtap.py
+++ b/kmk/modules/modtap.py
@@ -1,6 +1,8 @@
+from supervisor import ticks_ms
+
 from kmk.key_validators import mod_tap_validator
 from kmk.keys import make_argumented_key
-from kmk.kmktime import accurate_ticks, accurate_ticks_diff
+from kmk.kmktime import check_deadline
 from kmk.modules import Module
 
 
@@ -39,16 +41,14 @@ class ModTap(Module):
         '''Sets the timer start and acts like a modifier otherwise'''
         keyboard.keys_pressed.add(key.meta.mods)
 
-        self._mod_tap_timer = accurate_ticks()
+        self._mod_tap_timer = ticks_ms()
         return keyboard
 
     def mt_released(self, key, keyboard, *args, **kwargs):
         '''On keyup, check timer, and press key if needed.'''
         keyboard.keys_pressed.discard(key.meta.mods)
         if self._mod_tap_timer and (
-            accurate_ticks_diff(
-                accurate_ticks(), self._mod_tap_timer, keyboard.tap_time
-            )
+            check_deadline(ticks_ms(), self._mod_tap_timer, keyboard.tap_time)
         ):
             keyboard.hid_pending = True
             keyboard.tap_key(key.meta.kc)
diff --git a/kmk/modules/power.py b/kmk/modules/power.py
index b0a09d6..aa72eb1 100644
--- a/kmk/modules/power.py
+++ b/kmk/modules/power.py
@@ -1,9 +1,12 @@
 import board
 import digitalio
+from supervisor import ticks_ms
+
+from time import sleep
 
 from kmk.handlers.stock import passthrough as handler_passthrough
 from kmk.keys import make_key
-from kmk.kmktime import sleep_ms, ticks_diff, ticks_ms
+from kmk.kmktime import check_deadline
 from kmk.modules import Module
 
 
@@ -100,10 +103,10 @@ class Power(Module):
         '''
         Sleeps longer and longer to save power the more time in between updates.
         '''
-        if ticks_diff(ticks_ms(), self._powersave_start) <= 60000:
-            sleep_ms(8)
-        elif ticks_diff(ticks_ms(), self._powersave_start) >= 240000:
-            sleep_ms(180)
+        if check_deadline(ticks_ms(), self._powersave_start) <= 60000:
+            sleep(8 / 1000)
+        elif check_deadline(ticks_ms(), self._powersave_start) >= 240000:
+            sleep(180 / 1000)
         return
 
     def psave_time_reset(self):
@@ -120,7 +123,7 @@ class Power(Module):
         return
 
     def usb_rescan_timer(self):
-        return bool(ticks_diff(ticks_ms(), self._usb_last_scan) > 5000)
+        return bool(check_deadline(ticks_ms(), self._usb_last_scan) > 5000)
 
     def usb_time_reset(self):
         self._usb_last_scan = ticks_ms()
diff --git a/kmk/modules/split.py b/kmk/modules/split.py
index 0de7e17..c5dfd1c 100644
--- a/kmk/modules/split.py
+++ b/kmk/modules/split.py
@@ -1,10 +1,11 @@
 '''Enables splitting keyboards wirelessly or wired'''
 import busio
 from micropython import const
+from supervisor import ticks_ms
 
 from storage import getmount
 
-from kmk.kmktime import ticks_diff, ticks_ms
+from kmk.kmktime import check_deadline
 from kmk.matrix import intify_coordinate
 from kmk.modules import Module
 
@@ -241,7 +242,7 @@ class Split(Module):
 
     def ble_rescan_timer(self):
         '''If true, the rescan timer is up'''
-        return bool(ticks_diff(ticks_ms(), self._ble_last_scan) > 5000)
+        return bool(check_deadline(ticks_ms(), self._ble_last_scan) > 5000)
 
     def ble_time_reset(self):
         '''Resets the rescan timer'''