css and js optimization

The unused CSS/JS is being reported as being Autoptimize’s, but AO merely aggregates all the CSS/ JS provided by your theme & plugins, so if you (really) want to tackle “remove unused CSS/JS” then you should look into your theme & plugins (you might be able to get some improvement using e.g. “plugin organizer” to only allow plugins to work on specific pages).

There however is a new premium service that can remove unused CSS that could help. For more info see the Rapidload entry on Autoptimize’s “Optimize More” tab.

hope this clarifies,
frank