This is actually a better demonstration of the differences - http://frames-per-second.appspot.com/Dominic Crossman said:Just looked at your link, and while I can tell the diffrence, it is so minuscule that I can't see why people get up in arms about it. If they'd been shown one by one instead of side by side then I bet I wouldn't be able tell the difference.
And believe me, you'll see the difference between 30 and 60.
Consistent, and more to the point consistently high, frame rates are incredibly crucial for competitive games in the FPS and RTS genres.I think the only genre where it matters one iota is a fighting game such as Street Fighter.
With first person shooters any jitter or jarring transitions in frame rate; and critically low frame rates; can often have drastic effects on a number of things that play into the games and subsequently the players performance.
With RTS games, depending on type of course, poor frame rates can lead to positional and animation errors or desyncs. This can lead to a player having a much more difficult time effectively micro'ing and gaining proper unit and situational awareness.
This is lightly covered in this wiki - http://en.wikipedia.org/wiki/Frame_rate But further information on the topic can be found with a quick Google search.