It’s hard to recommend any Chromium-based browser in 2026 as Chromium no longer supports Manifest v2 extensions, breaking support for essential content blockers like uBlock Origin.

Even Brave, which has a built-in adblocker not based on extensions, is loaded with AI and Crypto bs, and as far as I’m aware, the adblocker portion of its code is closed source. This isn’t even mentioning the horrific political opinions expressed by the CEO of that company.

I keep a copy of raw ungoogled Chromium around for webUSB firmware flashing, but that’s it.

If I were you, I would try and figure out what is causing firefox-based browsers to run slowly - i.e. toggling on/off hardware acceleration in browser settings and see if that makes a difference.