The compress, is too much lossy, really making images low quality. Also in matters of performance, you won't achieve much. I did google Lighthouse test, pingdom, GTmetrix etc. All low scores, very limited difference between plugin on or off.
Furthermore the support is subpar, truly in this day and age, it should be better.
Overall, 2 taco's as the implementation is easy, and dashboard looks nice, however the plugin is not effective. Shame :( Hopefully soon, it'll all get better.