That’s weird .. there were no significant changes between 3.1.0 and 3.1.1 that would explain that change Mike. If you want you can always download and re-install 3.1.0 to re-test (and compare the resulting HTML to see what is different)?
When testing with Pagespeed Insight I indeed see 1.9s TBT, but of that 1.5s is due to 3rd party JS (Recaptcha, Maps are the big culprits):

Best approach for Maps would be to use an image of a map and have that link to (a page with embedded) Google Maps.
Recaptcha is another issue, I have yet to see a good way to render its performance-impact less severe .. :-/
hope this helps,
frank
How do I reinstall a prior version on my site? If I want to re-install ver. 3.1.0, would it overwrite all my settings? Would I need to reset everything to what I had previously?
Thanks – Mike
Frank, I understand that the embedded map and Recaptcha are not optimal. I did not change anything for either when I updated Autoptimize from 3.1.0 to 3.1.1 but I saw an increase in TBT using GT Metrix.
Thanks
morning Mike 🙂
How do I reinstall a prior version on my site?
simply download the zipfile and then go to plugins -> add new -> upload
If I want to re-install ver. 3.1.0, would it overwrite all my settings? Would I need to reset everything to what I had previously?
no settings are overwritten, nothing to be done really.
Were you able to rollback Mike and did that improve the TBT?
I rolled it back to ver. 3.1.0. I’m going to review it over the next few days using GT Metrix.
No feedback so I assume this got resolved Mike? Feel free to follow up if you still encounter issues!
have a nice day!
frank