Your object method calls are slower because the add on ISA lookup/maintenance (just because it is a method), a variable dereference and a hash lookup. The base closure is just a function and postincrement. It makes sense for one to be slower, both perform the same task, one has to do a bit more janitorial work. Consider though, that your closure might be heavier in memory requirements. Does any of this really matter? Probably not. This is not the sort of thing I worry about. Generally my decision on how to organize my data is driven by other requirements than method call overhead. In fact, it always is. Except for once when I was doing a really, really big batch job. Then I used plain functions.
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