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Bump! Lua is small and sweet. Zed Shaw picked it for his framework, not that unlike Raphters in some ways: http://tir.mongrel2.org/home

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Specifically, the luajit implementation is known for being ridiculously fast.

http://luajit.org/performance.html

http://lua-users.org/lists/lua-l/2009-06/msg00071.html

Normal Lua's performance is also quite decent (especially compared to its peers: Python, Ruby, and Perl), and has a very clear path for moving hotspots out to C. LuaJIT's performance is just a bonus. :)

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