Originally Posted by Wandamey
i mean, the handler has an identifier : control/"OnWhatever", i thought what you store in it would replace the old one
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Yes, of course. The problem is probably not SetHandler per se. It's the fact that creating a closure requires a dynamic allocation (I don't even know whether just one, or one for each variable; depends on how much Lua optimizes that). Remember that everything you allocate must eventually be collected after you discard it. Too many closures might be thrashing the garbage collector.
Originally Posted by Wandamey
re edit : to understand why i'm a bit puzzled, maybe i should add that until now I thought that the interest of having local vars was that (i believed) they were trashed after the function was run
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Local variables may only exist in registers (i.e. cost virtually nothing) as long as they're not used in any closure. Once you create a closure, they HAVE to be moved to dynamically allocated memory, because the closure typically outlives the block it has been created in.