I was curious to test the actual input latency of the different Tetris variants I've been playing on my (on paper) suboptimal system. Other threads report that both Windows 7 64 bit and the 'keyboard input hack' are dealbreakers for running TGM3 and even WinXP and a standard PC CRT will be more than 8 frames of input latency, but I measured on the low end of arcade clone WinXP+Arcade IO+lagless display results with only a Win7x64 system+LCD monitor in TGM3. Results: Actual time from keypress to piece moving on monitor (keyboard->indicator latency)+(indicator->display latency): Tetris The Grandmaster shmupmametgm: 5 frames TGM2+ shmupmametgm: 4 frames TGM3: TI default keyboard input hack: 6 frames Tetris with Cardcaptor Sakura Eternal Heart epsxe windowed: 6 frames Tetris Friends High Quality /w Adblock, Chrome: 6 Frames edit Texmaster 3 frames There was no difference between windowed and fullscreen latency for any TGM game on my system. I used a novel testing method that I don't believe has been used elsewhere but is easily done on any system by anyone who has a 240fps or better camera. Method: 1.Use 240fps camera to determine latency between capslock keypress and capslock indicator (measured as 4frames@240fps, equivalent to 1frame@60fps on my keyboard, consistently reproduced). 2.Rebind left input to capslock key in game. Use 240fps camera to determine latency between keyboard capslock indicator and piece moving left on screen. Add both to determine actual latency. My PC: Win7x64 Geforce GTX650Ti i5-2400 12GB RAM BenQ G2222HDL DVI Using a CRT monitor would be ideal and further reduce these latencies (presumably significantly, perhaps a frame or more). I will try to get access to one. I was just counting frames manually advancing one by one and doing my math in a notepad, but I believe this method is quite accurate. Am I just looking at old information and this is normal performance, or does this appear to be much better than expected for my configuration? Is my method horribly flawed? Putting together an analysis/proof video would be an lot of work if this is not contrary to what is currently believed.