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This function is very fast compared to standard _StringRepeat() when number of repeated chars is big. In my tests this version is faster than original for > 50 chars. Time needed for this new StringRepeat() is constant no matter how many chars you repeat (nCount) so for big numbers of repeated characters it's MUCH FASTER (hundred times). StringRepeat Function: Func StringRepeat($sChar, $nCount) $tBuffer = DLLStructCreate("char[" & $nCount & "]") DllCall("msvcrt.dll", "ptr:cdecl", "memset", "ptr", DLLStructGetPtr($tBuffer), "int", Asc($sChar), "int", $nCount) Return DLLStructGetData($tBuffer, 1) EndFunc Testing example for compare speed with standard _StringRepeat (try to change number of chars): #include <String.au3> $start = TimerInit() _StringRepeat('a',1000) ConsoleWrite(TimerDiff($start)& @CRLF) $start = TimerInit() StringRepeat('a',1000) ConsoleWrite(TimerDiff($start)& @CRLF) Func StringRepeat($sChar, $nCount) $tBuffer = DLLStructCreate("char[" & $nCount & "]") DllCall("msvcrt.dll", "ptr:cdecl", "memset", "ptr", DLLStructGetPtr($tBuffer), "int", Asc($sChar), "int", $nCount) Return DLLStructGetData($tBuffer, 1) EndFunc EDIT: There is one difference/limitation from original _StringRepeat(): This new StringRepeat() can repeat only one character, so it's not posiible to do: StringRepeat('abc',3) --> result is 'aaa' Maybe I should change its name from StringRepeat() to CharRepeat() EDIT2: Here is MemSet in form of UDF: Func MemSet($pDest, $nChar, $nCount) DllCall("msvcrt.dll", "ptr:cdecl", "memset", "ptr", $pDest, "int", $nChar, "int", $nCount) If @error Then Return SetError(1,0,False) Return True EndFunc