PC Master Race

The performance bit is a lottery. Some people won't notice any significant difference from chrome. A few will have severe issues. For most the slowdown will be circumstantial or won't even notice.

Sites that don't load properly are few and far between. Mostly poor web developers who are doing something undocumented or applying outdated practices. Often is just targeting some behavior that works on Chrome but is not standard. Firing up Brave to open the odd page once in a blue moon is not too extreme to ask. Specially since it's the result of Google's influence on the W3C standards and forcing their way upon others.

Brave iscool and all. But everytime I open it I fear it's going to backdoor a cryptominer into my machine. It just gives that vibe.

You're posting on Lemmy and you joined seven days ago, so it's a safe bet that you have some opinions about Reddit. So I'll put it this way: if you have a problem with the way Reddit concentrates power in the hands of u/Spez and want to support alternatives because of that, then you should also have a similar problem with how Chromium-based browsers concentrate power in the hands of Google and reject Brave in favor of Firefox.

Performance wise widely depends on the site used. Some sites (notably Google ones) are notorious for implementing anti-competitive behavior, where if their website is visited other than a chromium based browser, it slows down or a functionality stops working.

I mean its the whole reason why Microsoft switch from Edge Edge HTML to Edge Chromium/Blink.

The only good reason right now if you want to stick with Chromium based browsers such as Brave is you're heavily into browser based games as currently Chromium (and it's older brother, webkit) are the ones that have the best webgl performance, Firefox can do it but not as fast as Chromium and performance impact is very noticeable