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What is the acceptable latency for keyboard input? acceptable here means that a person doesn't notice the lag even subconsciously? For me the responsiveness of the interface is critical for a good impression on the game dynamics. So what should be the aim for designing input processing loop?

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Personally I think it is under 100ms. From tests I did with a stopwatch. But if you think "fire" from mouse click, for a game like quake3 I'd say you better take it in account under 8 or 16ms (one frame at 60 or 125hz). otherwise some hardcore competitor will notice. Also don't forget usually PC displays stuff 3 frames late. (driver pipelining + LCD buffering for overdrive) –  v.oddou Jun 22 at 7:07
    
draw to the next frame is a good point, thanks –  techtonik Jun 22 at 7:13

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