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Luiz Henrique de Figueiredo <lhf <at> tecgraf.puc-rio.br> writes:

> "Furthermore, we made a series of incredible performance enhancements to
> the execution speed and memory management of the interpreter. We greatly
> decreased table access times and improved the performance of the garbage
> collector."

I would GUESS that their enhancements involved semantic restrictions or
app-specific tunings.  E.g., limiting table keys to strings, getting rid
of metatables, memory pooling for a common object size...

I'm just guessing, of course, but I wouldn't get my hopes up about
their changes feeding back into Official Lua.