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Comment Re:Latency sensitive people (Score 3, Interesting) 175

Assume 60 fps, synced with 60Hz monitor. That's 16.7ms per frame, and usually means a target budget of 16.7ms per iteration in the game loop - and input is probably processed exactly once in the game loop. Consider also that many decent displays already lag by a frame or two. So in a local hardware situation, you already have a built-in lag somewhere in the region of 30ms or so, pretending there isn't any lag in the actual hardware path between devices and what the OS surfaces to apps.

Now, given the above assumptions, but factoring in your posited reactive input model (i.e. no delay from game loop), you think that's good enough? The way I see it, it can only be good enough if the round trip averages to less than 16ms or so; and even then, it's not great. I've long noticed the lag in games since moving from CRT to LCD, and I can even see the lag between moving my mouse and the pointer moving across the screen - it's small but perceptible, and is either caused by the mouse / usb / driver path or by the LCD delay.

But I can't realistically see a 16ms or so round-trip being achievable outside heavily populated areas and without lots of expensive hardware very close to local loops. As it is, Google.com is 29ms away from my machine, and it's still slow to download the front page's HTML content - (yes, I know, TCP connection, several round trips, etc.) - on the order of 200ms or so.

It seems to me that round trips on the order of 50 to 100+ms are more likely, and delays of that nature are highly, highly noticeable in twitch FPSes - especially when it comes to things like changing the view direction. Pretty much all multiplayer FPSes don't wait for a server round-trip for changing the view direction. In that situation twitch FPSes will suck.

Other kinds of games may work better.

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