PyPy simply isn't at the same level as V8 and LuaJIT yet. V8 is a professional, full-time project employing some of the best programmers money can buy. And Lua

PyPy simply isn't at the same level as V8 and LuaJIT yet. V8 is a professional, full-time project employing some of the best programmers money can buy. And LuaJIT.. well LuaJIT is written by a fucking genius 10x programmer. Let me quote him: " The reason why X is slow, is because X's implementation is slow, unoptimized or untuned. Language design just influences how hard it is to make up for it. There are no excuses. " Source: http://www.reddit.com/user/mikemike http://www.reddit.com/user/mikemike (that's his reddit account) Python (and Ruby for that matter) could reach a comparable performance level if people with the necessary skills invested the necessary amount of effort.