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>   - Lua didn't "just do things" that other languages might. One that
>     hit us was performance -- initial tests of the application showed it
>     taking 50x as much time as the same app coded in C++.  A few simple
>     optimizations got it down to about 5x, which was acceptable. These
>     were optimizations that any modern C/C++ compiler would do
>     automatically.

That reminded me the case, when I wrote crypt_sha256 (or 512? Whatever) on Lua 
(just for preactice), and it was 2x-5x faster than reference C/C++ 
implementation from the author of the document (Ulrich Drepper, AFAIRC) :)