Sorry I was out for a vacation. Here you go.
This is firefox
This is Brave origin.
Even though some things do load after 5s in brave as well, a website is instantly usable on Brave while Firefox takes the whole time to load it. The Firefox install above is a fresh one with just uBlock Origin. On Brave I have set it up to clear cache and browsing history on exit so nothing is being loaded from cache. No login used for the website tested in both browsers. On reddit as well usually, it takes Firefox around 12s to actually for it to be usable. While for Brave it is usually around 8s.





Alright I got somewhere. It’s the DNS. Specifically my Adguard Home setup. By default it uses rate limiting of 20 requests per client. I removed it. And now Firefox is loading as fast as Brave was loading it previously.
Although websites on Brave are still loading much faster, Firefox is now pretty usable. A few hundred ms difference is fine for me. The slowdown started happening since Firefox 150ish so probably something changed then that affected Firefox but Chromium based browsers worked fine. IDK what but for now removing rate limiting works for me. Hopefully my router won’t crash because of this. Thanks for the help. Also if I use Firefox DoH with custom Controld endpoint, everything loads at lightening speed. But I can’t use it as there are DNS rewrites in my Adguard Home which allows me to access my services w/o typing the IP all the time.