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 (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.
