procedure TMainTimeing.Execute;
var
 Timer : TStopWatch;
 MS : Int64;
 FPS : Single;
begin
  Timer := TStopWatch.Create;
  Timer.Reset;

  while not(GameEnd) do
    begin
      try
        Timer.Start;

        GameScreen.Bereinigen;
        GameScreen.BeginUpdate;
        try
          try
            FPS := PacMan.NextFrame;
          except
            MS := 1;
          end;
        finally
          GameScreen.EndUpdate;
        end;

        TThread.Synchronize(NIL,Procedure()
        begin
          PacForm.BeginUpdate;
          try
            PacForm.Image1.Bitmap.Assign(GameScreen.Screen[GameScreen.AktScreen]);
          finally
            PacForm.EndUpdate;
          end;
        end);

        Timer.Stop;
        MS := Timer.ElapsedMilliseconds;
        Timer.Reset;

        if MS < FrameRate then
          Sleep(FrameRate-MS);
      except
        GameEnd := true;
      end;
    end;
end;