Hey nick, I use
https://developers.google.com/speed/pagespeed/insights/ since that is probably how google test speed for websites, I still score high 96-99 on desktop version but it now scores 80 on on mobile
when you go to a live cam room it scores 39% on mobile, 80% on desktop
I watch to use that because google is using speed as a ranking factor now.
I use wp super cache
autooptimize not sure what else I can do.