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Firefox 3.5 has a new JavaScript engine, TraceMonkey, that runs many JavaScript programs 3-4x faster than Firefox 3, speeding up existing web apps and enabling new ones. This article gives a peek under the hood at the major parts of TraceMonkey and how they speed up JS. This will also explain what kinds of programs get the best speedup from TraceMonkey and what kinds of things you can do to get your program to run faster.