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The more includes you have the more of a performance hit you will take .. but that performance hit can be almost completely illiminated by using PHP with a compiler cache.
Without a compiler cache I don't think using PHP would be faster than SSI.. but with the compiler cache all the includes would be performed once.. then the PHP script would compiled and cached so all your includes would essentially be run once every so often (when the cache expires) rather than on every single request ... which would virtually illiminate the overhead of having all those includes.
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