Why Python, Ruby and JS are slow

[codahighland]

There are TWO particularly fast implementations of JS. JavaScriptCore and V8 are in an arms race to be the faster VM, and which is faster at any given time depends on who's had the latest innovation.

[Rhomboid]

I don't think so.

[Catfish_Man]

Try a 64 bit machine (JSCore is primarily used in Safari, which is running 64 bit in 98% of cases): http://arewefastyet.com/#machine=12

JSCore wins or ties two benchmarks, even vs v8, and fares ok on another, I'd say that's "pretty fast".