Well php comments from my judgment would effect the page by a few microseconds and there are 10000 microseconds in a second. And as for html/css/javascript comments, they only effect the download time by a few bites. To calculate how much they effect the download time it is the number of letters/numbers/characters = number of bites (1024 bites in 1KB). So really comments overall might effect the page by one tenth of a second if you use a lot of html/css/javascript comments.
cwarn23
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