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Fix modifier key lag #1

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Fix modifier key lag #1

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ddcda67
Force 1ms Windows timer resolution for accurate SetTimer and Sleep in…
WhittJS Mar 11, 2026
080af77
Replace modifier polling with hook-based instant detection
WhittJS Mar 11, 2026
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45 changes: 41 additions & 4 deletions bongo_cat_presser.ahk
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Original file line number Diff line number Diff line change
Expand Up @@ -11,17 +11,51 @@

#SingleInstance, Force
#Persistent ; Keeps the script running to allow for the high-frequency timer.
#InstallKeybdHook ; Hook-based detection for instant modifier response.
#InstallMouseHook ; Hook-based detection for instant mouse button response.
SetBatchLines, -1

; Force 1ms timer resolution (default is ~15.6ms, making SetTimer and Sleep inaccurate).
DllCall("winmm\timeBeginPeriod", "UInt", 1)
OnExit("CleanupTimerResolution")

; --- CONFIGURATION ---
KEYS_TO_PRESS := ["F21", "F22", "F23", "F24"] ; A pool of safe keys to press at random.
PRESS_INTERVAL_MS := 10 ; How often to press a key (in milliseconds).
CHECK_INTERVAL_MS := 5 ; How often to check for user input (for pausing).

; --- MAIN SCRIPT LOGIC ---
; --- STATE ---
global Toggle := false
global ModifierHeld := false
global lastPressTime := 0

; --- MODIFIER HOOKS ---
; ~ lets the key pass through normally, * fires regardless of other modifiers.
; These fire instantly via the keyboard hook — no polling delay.
~*LShift::
~*RShift::
~*LCtrl::
~*RCtrl::
~*LAlt::
~*RAlt::
~*LButton::
~*RButton::
ModifierHeld := true
return

~*LShift Up::
~*RShift Up::
~*LCtrl Up::
~*RCtrl Up::
~*LAlt Up::
~*RAlt Up::
~*LButton Up::
~*RButton Up::
; Only clear if no modifiers are still physically held.
if !GetKeyState("Shift", "P") and !GetKeyState("Control", "P") and !GetKeyState("Alt", "P") and !GetKeyState("LButton", "P") and !GetKeyState("RButton", "P")
ModifierHeld := false
return

F8::
Toggle := !Toggle
if (Toggle) {
Expand All @@ -33,9 +67,8 @@ F8::
return

MainLoop:
; THE FIX: This loop runs very fast (every 10ms) to check for user input.
if GetKeyState("Shift", "P") or GetKeyState("Control", "P") or GetKeyState("Alt", "P") or GetKeyState("LButton", "P") or GetKeyState("RButton", "P")
return ; Instantly skip if a modifier is held.
if (ModifierHeld)
return

; Now, check if enough time has passed to send the NEXT keypress.
if (A_TickCount - lastPressTime > PRESS_INTERVAL_MS)
Expand All @@ -53,6 +86,10 @@ MainLoop:
}
return

CleanupTimerResolution() {
DllCall("winmm\timeEndPeriod", "UInt", 1)
}

Esc::
ExitApp
return