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Hello, I wrote a benchmark script to measure variable declarations to find out whether you should focus more on static or global variables #cs ---------------------------------------------------------------------------- AutoIt Version: 3.3.14.5 #ce ---------------------------------------------------------------------------- #Region Pre-Setting Local $iTally1 = 0 Local $iTally2 = 0 Local $iTally3 = 0 Local $iTally4 = 0 Local $iTally5 = 0 Local $iTally6 = 0 Local $iTally7 = 0 Global $GLOBALCONST1 = 1 Global $GLOBALCONST2 = 1 Global $GLOBALCONST3 = 1 Global $GLOBALCONST4 = 1 Global $GLOBALCONST5 = 1 #EndRegion Pre-Setting #Region Test Functions Func s1() Static $i = $GLOBALCONST1 Return $i EndFunc Func g2() Return $GLOBALCONST2 EndFunc Func g3() Static $i7 = "gsdgdfegbgbrwefw" Return $GLOBALCONST3 EndFunc Func g4() Static $i1 = 1 Static $i2 = "asd" Static $i3 = 234 Static $i4 = True Static $i5 = [0] Static $i6 = "hgsdg" Static $i7 = 1 Static $i8 = 1 Static $i9 = 1 Static $i0 = 1 Return $GLOBALCONST4 EndFunc Func g5() Local $i = $GLOBALCONST5 Return $i EndFunc Func g6() Local $i = 1 Return $i EndFunc Func g7() Return 1 EndFunc #EndRegion Test Functions #Region Benchmark Loop For $i = 0 To 15 Local $tDelta = TimerInit() Do $iTally1 += s1() Until TimerDiff($tDelta) >= 1000 Local $tDelta = TimerInit() Do $iTally2 += g2() Until TimerDiff($tDelta) >= 1000 Local $tDelta = TimerInit() Do $iTally3 += g3() Until TimerDiff($tDelta) >= 1000 Local $tDelta = TimerInit() Do $iTally4 += g4() Until TimerDiff($tDelta) >= 1000 Local $tDelta = TimerInit() Do $iTally5 += g5() Until TimerDiff($tDelta) >= 1000 Local $tDelta = TimerInit() Do $iTally6 += g6() Until TimerDiff($tDelta) >= 1000 Local $tDelta = TimerInit() Do $iTally7 += g7() Until TimerDiff($tDelta) >= 1000 Next #EndRegion Benchmark Loop ConsoleWrite(@CRLF&"Static1: "&$iTally1&" pkt"&@CRLF&"Global2: "&$iTally2&" pkt"&@CRLF&"Global3: "&$iTally3&" pkt"&@CRLF&"Global4: "&$iTally4&" pkt"&@CRLF&"Local5: "&$iTally5&" pkt"&@CRLF&"Local6: "&$iTally6&" pkt"&@CRLF&"Hardcode7:"&$iTally7&" pkt"&@CRLF) #cs Result Static1: 10291881 pkt global to static Global2: 13977324 pkt only global Global3: 9886169 pkt global and static Global4: 2933051 pkt global and many statics Local5: 9937314 pkt global to local Local6: 10306484 pkt only local Hardcode7: 14835319 pkt no variable #ce Result: 100% no variable, hardcore value 94% only global variable use 69% only local variable use with hardcore value set 69% only static variable use with global variable value set 67% declaration of local variable with global variable value set 66% only global variable use with one static variable beside 20% only global variable use with ten static variables beside My thesis of the result: Be careful with declarations, whether local, global or static Note: in my test the global variable performance was better than the local one, but in practice the global one would lose performance due to multiple operations What is your best practice sharing data between multiple functions?

Thanks to everyone who replied in this thread I was able to realize my long-awaited solution Simplified snippet: #include <GUIConstantsEx.au3> #include <ScreenCapture.au3> Global $g_hGUI = GUICreate("GDI+ test 2", 600, 600, -1, -1) GUISetState(@SW_SHOW, $g_hGUI) _GDIPlus_Startup() Global $g_hGraphics = _GDIPlus_GraphicsCreateFromHWND($g_hGUI) OnAutoItExitRegister("CleanupResources") Local $tDelta = TimerInit() Do If TimerDiff($tDelta) >= 67 Then ; => 30 FPS $tDelta = TimerInit() RefreshImage() EndIf Until GUIGetMsg() == $GUI_EVENT_CLOSE Func RefreshImage() Local $hHBmp = _ScreenCapture_Capture("", 0, 0, 500, 500) Local $hBitmap = _GDIPlus_BitmapCreateFromHBITMAP($hHBmp) _GDIPlus_GraphicsDrawImage($g_hGraphics, $hBitmap, 50, 50) _WinAPI_DeleteObject($hHBmp) _GDIPlus_BitmapDispose($hBitmap) EndFunc Func CleanupResources() _GDIPlus_GraphicsDispose($g_hGraphics) _GDIPlus_Shutdown() GUIDelete($g_hGUI) EndFunc