Hi,
Please enable all CCC options. and those cache files were generated by Prestashop automatically, which was compressed already. and those files keep changes every time when settings change, so it is impossible to compress them again. you can try some CND to speed up your site.
Best regards.
Hi yobo,
Finally that was a server issue, solved by hosting company. Now I have a mobile rating of 60/100 (before was 20/100), and desktop 97/100! Amazing! I will look to improve even more mobile rating.