I think you're spot on with that, Gilzow. Although I don't imagine it adds much overhead at all - probably a few milliseconds in it, I would assume, without profiling it.

After all, how much would include differ from include_once? All it needs to do is check if the file has already been SSI'd - and it all depends how it goes about that. I imagine with a call to an internal log of some kind which would be rather speedy.

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