Unfortunately the developer of Autoptimize has not responded to any support questions for more than 9 month and can also not be contacted by other means. Emilio (turl), if you are still here, please give us a life-sign.
If not, is there any other developer out here who is interested in maintaining this excellent plug-in? So far, it's the best of its kind, but has a few minor issues - probably related to incompatibility with recent WP versions.
- Expired cache files do not get purged automatically. Therefore cached .css and .js files pile up (infinitely?) unless you manually clear the cache.
- Cosmetic glitches in sub-menues.
- And finally, the admin bar does not get printed.
Otherwise it really does an excellent job and is the fastest minify plug-in around.