Edge and Brave browsers load slowly, while Opera and Firefox are not affected

Question

I have been trying to fix my website loading extremely slowly until I just tested it in another browser (opera) and it pinged! No need to wait at all. However in Edge and Brave it hangs for a few minutes... I'm using php/xammp and the site is loading sql resources (eg 50-100 results) and then when using simple tags like

tag ) it just takes a long time when iterating over it, or it doesn't work at all. how so? I also tested it in Firefox and it was lightning fast, just like in Opera

Edit: I know that iteration of SQL resources happens server-side and outputs before rendering in the browser, but this is what confuses me.

Answer 1

I validated the page on w3 validator and fixed the conflict with the meta tag and http-equiv attribute "charset=utf-8" and the page works fine.