I have a site with joomla with a good template and excellent performance. The only problem remains the same: the speed for mobile on google pagespeed. On my site with joomla 3.9.x I have activated all the caches: 1) JCH Optimize 2) Page Cache 3) Cache in global configuration and compression in GZIP
For the moment the speed is 37/47 on mobile and 83/90 on Desktop. Google always reports: "Delete view blocking resources", referring to the js and css files. Finally it also indicates that there is an unused js and css code. These slowdowns mean 2.5 seconds more upload for google.
I have tried everything to improve this aspect but the problem of the js and css that slow down the speed on page speed remains.
Any suggestions on how I could do it?