I've seen competitive gamers tweak their systems to get 200+ frames per second. Can't the human eye only see 30-60 fps? Why do people do this?
by 
Sigma6
ANSWERS: 3
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This is important because when you get into a "firefight", that is, when there are a lot of people/objects on the screen, your system will slow down. Because it has to process so much graphical information, your system could chug down to the 30 frames per second range or even lower (below 10!). Because of this, people try to make sure their average frame rate is as high as possible, so that their "worst case" framerate will also be as high as possible.
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The human eye can actually see *way* past 200fps (it has been military tested). It is a common misconception that it is much lower because of film only being 25fps. Film has motion blur, games (normally!) do not. 120fps can 'feel' better than 60 despite people telling you otherwise. The issue with how many fps the eye can percive is complex and really I think the other answer is more what you are asking. when you reach 10/15 fps in a fast paced game it becomings very difficult to do anything because of the video lag you get. It is incredibly frustrating and not desirable at all. If you can get 200fps in an empty room, you've got a good chance of getting a decent fps in a room full of people, rockets, gibs, etc etc.
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A good maximum is the refresh rate that your monitor is set at. A higher FPS than the refresh rate might be noticeable, even though the monitor wont be displaying every frame, especially with objects in the distance - they will move smoother between the frames that you do see. Those tweakers would be better off sacrificing some of that frame rate for better quality settings. thats subjective, though. A good minimum to go for is 60fps. a lot of people find 30fps to be almost unplayable.
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