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Does the fact that I install unnecessary modules make PHP overall slower? e.g. php-tidy, php-xmlrpc, php-bcmath.

I use the latter only on very rare occasions. Would like to have it (and at least 5 other extensions) only if that doesn't mean any significant system resource usage increase.

We are talking about a server that's handling 200 000 to 500 000 requests daily.

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Run slower? Likely not. Take a larger amount of memory? Yes. If your system is memory constrained, and that's leading to performance issues, then reducing the number of modules may help, but otherwise, I don't think it's worth doing anything.

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