I just upped Autoptimize 2.9 beta to version 4, which is likely to be the last version before the official 2.9 release (eta end June/ early July).
Main new features;
- defer all JS (also inline)
- nextgen images without lazyload
- per page/post settings
- misc. bugfixes and smaller improvements
You can download the beta from Github (do disable 2.8.x before activating 2.9-beta-4) and you can log any issues/ bugs over at https://github.com/futtta/autoptimize/issues
Looking forward to your feedback!