Well, first, even assuming JITing JavaScript is expensive and produces expensive code, shouldn't WebGL demos mostly stress the GPU and not the CPU? Second, web

Well, first, even assuming JITing JavaScript is expensive and produces expensive code, shouldn't WebGL demos mostly stress the GPU and not the CPU? Second, web sites are not allowed to execute native code, but all the modern JavaScript engines compile down to native code. My intuition tells me to expect the performance of compiled JavaScript to be low, however I have seen endless benchmarks that say that's not the case and JITed JavaScript should be plenty fast. However I feel this disconnect between those benchmarks and reality. The benchmarks say it's fast, while in fact I perceive it to be pretty slow and a resource hog.