System Delphi

// Wait 0.2ms
procedure PerformanceDelay;
var
hrRes, hrT1, hrT2, dif: Int64;
begin
if QueryPerformanceFrequency(hrRes) then
begin
QueryPerformanceCounter(hrT1);
repeat
QueryPerformanceCounter(hrT2);
dif := (hrT2 - hrT1) * 10000000 div hrRes;
until dif > 2;
end;
end;