WordPress doesn’t really offer this functionality. You basically grab the array of enqueued scripts + styles and minify & concatenating them before they are output (using 3rd party script), of course you would want to cache this as well. This is quite complicated so I suggest instead:
- There are several plugins on wordpress.org that do this, just search for “minify”.
- Do this on the server side with something like
mod_pagespeed - Do this on your side with something like YUI
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