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Changes between Initial Version and Version 1 of Ticket #53670, comment 2

initial	v1
7	7	There definitely will be some milliseconds of disk i/o to get the files, and some MB of memory to load them, but not sure if that would be a "deal breaker" amount of resources.
8	8
9		On the other hand having a big amount of "fake" functions defined when not in wp-admin has its costs and potential problems. For example it will increase the total number of functions and classes quite a bit which (as far as I remember) slows down PHP by a tiny bit for each one. That slow-down, even if it is very minimal, will be happening every time WP runs on the front-end.
	9	On the other hand having a big amount of "fake" functions defined when not in wp-admin has its costs and potential problems. For example it will increase the total number of functions and classes quite a bit which (as far as I remember) slows down PHP by a tiny bit for each one each time it makes a function call. That slow-down, even if it is very minimal, will be happening every time WP runs on the front-end.
10	10
11	11	So we're probably looking at slowing all WP sites by a little bit while speeding up some/few sites in some cases.