SteamOS is arch based and uses KDE Plasma as the default DE, so you could probably run Endeavour OS and be pretty darn close

Discord is another, goes into effect on the 15th

If this was a recent occurrence, it may have been from the 6.6.5 kernel. There was a WiFi regression in that version that did exactly that, slowed the system to an absolute crawl. I got hit by it on my PC and ended up hosing my whole install (because I panicked and botched things up), but my laptop was fine. I finally got things reinstalled a couple days later when 6.6.6 was released, which fixed the regression anyway.