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>I tried it with Lua 4, and it made quite a large difference, esp. if you
>used the dodgy switches to speed floating point operations.

With gcc, try compiling Lua 5.0 (beta) using these switches:

  -D'lua_number2int(i,d)=__asm__("fldl %1\nfistpl %0":"=m"(i):"m"(d))'
  -fomit-frame-pointer

--lhf