MsgBox % mod(100, 3)

   Sleep(ms) {
		DllCall("Winmm\timeBeginPeriod", "UInt", 3)
		DllCall("Sleep", "UInt", ms)
		DllCall("Winmm\timeEndPeriod", "UInt", 3) 
   }

SetBatchLines, -1
DllCall("QueryPerformanceFrequency", "Int64P", frequency)
PS := new PreciseSleep()

DllCall("QueryPerformanceCounter", "Int64P", start1)
PS.Sleep(100)
DllCall("QueryPerformanceCounter", "Int64P", end1)

DllCall("QueryPerformanceCounter", "Int64P", start2)
PS.Sleep(1200)
DllCall("QueryPerformanceCounter", "Int64P", end2)

PS := ""
MsgBox, % (end1 - start1)/frequency * 1000 . "`n" . (end2 - start2)/frequency * 1000

class PreciseSleep {
   __New(TimePeriod := 3) {
      this.timePeriod := TimePeriod
      DllCall("Winmm\timeBeginPeriod", "UInt", TimePeriod)
   }
   __Delete() {
      DllCall("Winmm\timeEndPeriod", "UInt", this.timePeriod)
   }
   Sleep(ms) {
      DllCall("Sleep", "UInt", ms)
   }
}

SetBatchLines, -1
PS := new PreciseSleep
start := A_TickCount
PS.Sleep(1000)
end := A_TickCount - start
PS := ""
MsgBox, % end

class PreciseSleep {
   __New(TimePeriod := 3) {
      this.timePeriod := TimePeriod
      DllCall("Winmm\timeBeginPeriod", "UInt", TimePeriod)
   }
   __Delete() {
      DllCall("Winmm\timeEndPeriod", "UInt", this.timePeriod)
   }
   Sleep(ms) {
      DllCall("Sleep", "UInt", ms)
   }
}