From the project wiki: 'In the beginning google Chrome was the fastest. After more and more optimizations were implemented Firefox was little bit faster then G

From the project wiki: 'In the beginning google Chrome was the fastest. After more and more optimizations were implemented Firefox was little bit faster then Google Chrome. When IE10 became compatible with my code it was the fastest. After implementing the worker thread Firefox 22 got superior being 3 times faster then the other browsers. For some reason this advantage got lost with Firefox 23. Instead of this Google Chrome managed with version 29 to get this position with 30-50 MIPS. At this moment changing one line of code in the Step() function could reduce or increase the speed by a factor of 3. The reason for these speed oscillations is the tremendous complexity of todays JIT compilers and the black box behavior of them which makes it almost impossible to code really fast code.'