If you consider performance important, you really should use one of the many caching plugins to do page caching. Some good candidates to complement Autoptimize that way are e.g. Speed Booster pack, KeyCDN’s Cache Enabler, WP Super Cache or if you use Cloudflare WP Cloudflare Super Page Cache.
Autoptimize Pro is a premium Power-Up, adding image optimization, CDN, automatic critical CSS rules and extra “booster” options, all in one handy subscription to make your site even faster!!
We provide great Premium Support and Web Performance Optimization services, check out our offering on https://accelera.autoptimize.com/!
(Speed-surfing image under creative commons by LL Twistiti)