I have Noticed tested on XP SP3 running a Pentium P4 3.2GHz Processor using AutoiIt 3.3.0.0 and Beta 3.3.1.1 In the first loop returns the value only changes approximately every 250 in jumps of 15 or 16 In the second loop with the 15 millisecond sleep @MSEC returns a different each time as expected. Is this a bug or the limit of AutoIt's time resolution? For $i = 1 To 1000 ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : @MSEC = ' & @MSEC & @crlf & '>Err