IIRC, code sections with foreign call cannot be traced by the compiler... Or, if they can be, the performance would be worse than not doing it (my memory is a b

IIRC, code sections with foreign call cannot be traced by the compiler... Or, if they can be, the performance would be worse than not doing it (my memory is a bit foggy). A custom API for LuaJIT is in the works, to alleviate this problem. Extensions will have to be written twice though, if one wants to support both runtimes.