Hi man ,
Your plugin it's very awesome , i can't believe this plugin magic , with Autoptimize and some tips my score it's 98/100 in Google speed test ( Pro3xplain[dot]com ) and i can make it 100/100 but i didn't Minifi the external files of Google Adsense .
I can't minify it with Autoptimize , so what i did it's : i copied some external files ( e.g : Google Analytics , Twitter Widget ...) to my host . And i can make cron job , every 12H refresh these external files ( copied the new files from the original website and pasted to my host ) .
The problem here , it's the external files of some other plugin (e.g : jetpack , facebook comments ... ) you must search it , and chage the URL from external to internal .
Autoptimize can detect the external files but it doesn't minify it , so i share with you my ideas , if you can update the plugin to minify external files ( css/js ) and refresh it every 12H