Looking in the forums I don't really see a definitive answer to use mod_pagespeed or not. Last mention of it is from 2018. some say they had good speed experiences, other mentions from a decade ago say not well supported in CS-Cart.
Yes or no, should I enable it on my server? (I am thinking yes)
I had it running for a while but kept running into small issues and could not find the time to finetune it further... but it seemed to do a decent job.
I tried it out but it ended up blocking DevTools in Edge and only gave a couple of points increase in PageSpeed Insights and GMetrix testing.
I'd rather have the tools than the point or two.
Perhaps with some dedicated tweaking it may be worth it down the line but for now I'll concentrate on other priorities