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var
  Zeit: Integer;
begin
  Zeit := GetTickCount;
  // Routine
  Zeit := GetTickCount - Zeit;                    

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var

    t1, t2, freq: Int64;
    res: Extended;
begin
    QueryPerformanceCounter(t1);
    // Routine
    QueryPerformanceCounter(t2);
    QueryPerformanceFrequency(freq);
    res := ((t2 - t1) / freq) * 1000;                    

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unit WaitCounter;

interface

uses Windows, SysUtils;

type
  TWaitCounter = class
  private
    FStart,
    FStop,
    FFrequency: Int64;
    FWaitTime: Extended;
    FSuccess: Boolean;
  public
    constructor Create;
    procedure Start;
    procedure Stop;
    property WaitTime: Extended read FWaitTime;
  end;

implementation

{ TWaitCounter }

constructor TWaitCounter.Create;
begin
  inherited Create;
  FSuccess := QueryPerformanceFrequency(FFrequency);
  if not FSuccess then
    raise Exception.Create(SysErrorMessage(GetLastError));
end;

procedure TWaitCounter.Start;
begin
  if FSuccess and not QueryPerformanceCounter(FStart) then
    raise Exception.Create(SysErrorMessage(GetLastError));
end;

procedure TWaitCounter.Stop;
begin
  if FSuccess and not QueryPerformanceCounter(FStop) then
    raise Exception.Create(SysErrorMessage(GetLastError))
  else
    FWaitTime := (FStop - FStart) / FFrequency;
end;

end.                    

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procedure DelayQPC(t: cardinal);
var  a, b: Int64;
Begin
    QueryPerformanceFrequency(b);
    QueryPerformanceCounter(a);
    b := a + (b * t) div 100000;   // 100000 = 0.01ms
    While a < b do QueryPerformanceCounter(a);
end;

//Aufruf:
  DelayQPC(1); //1 = 0.01ms, 10 = 0.1ms