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“TraceMonkey is a trace-based JIT compiler and it pushes the envelope on JavaScript performance. On average, we speed up Apple’s popular SunSpider benchmarks by factor 4.6 over the last release of Firefox. The overall runtime of SunSpider improved by about 1.83x (parts of SunSpider excercise things like the regular expression engine which is outside of the scope of JIT compilation, hence the lesser overall speedup). For the SunSpider ubench suite, which focuses on core JavaScript language features, we achieve a speedup of 22x. Whichever metric you chose to apply, Firefox now has the fastest JavaScript engine in the world.” source...