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John Resig touches three JavaScript issues: performance measuring - calling getTime() or using a browser extension like Firebug, plus performing complexity analysis -, creating games - should be multiplayer, hard to cheat, available on all devices, and addictive -, and performing distributed testing to evaluate how a program or game works in a real set.

At a fundamental level it's important to understand how JavaScript timers work. Often times they behave unintuitively because of the single thread which they are in. Let's start by examining the three functions to which we have access that can construct and manipulate timers.