How would I go about combining multiple CSS files and concatenating my scripts if they're being enqueued as WordPress recommends? My site is pretty slow and would like to optimize for performance.
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: