Thanks for the detailed feedback @Thiago_Mobilon !
I will work the list and try to cover everything eventually.
I just did a check here, and looks like your CSS in misconfigured on your Discourse site. You have double cache-control headers, and one of them is no-cache.
curl -v https://tecnoblog.net/comunidade/stylesheets/common_cd45efa28175431b0b8ff143783178d55206920b.css?__ws=tecnoblog.net -s 2>&1 | grep cache-control
< cache-control: max-age=31556952, public, immutable
< cache-control: no-store, no-cache, must-revalidate, private