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* Sylvain Fabre:

> If not, i would suggest to add  (in lua 5.3 :) ? ) a way to allow the
> increase/decrease of the memory counter used in the garbage collector
> from the "external world" (either with a new lua_gc method or with a
> lua_newuserboxeddata).
> Any suggestion or ideas on this ?

Have you tried adding a function which frees the picture memory to
your API?  That would mean that you could sustain a higher picture
allocation/deallocation rate independently of the garbage collector
implementation.  For such large and comparatively rare objects, the
additional burden on the programmer does not seem that large.

Obviously, it depends a lot on your environment if this is feasible.