sudden slow internet speed on windows 11

Same here. New gaming laptop after Win 8.1 running oldie died.
There's a reason why I didn't update for that long.

I'm not convinced the heads at Microsoft (and Adobe, Creative Cloud my friends...) actually test their stuff in normal working conditions outside a Powerpoint pitch-perfect presentation involving sweat, tears and joy.

After the update, my somewhat slow net has dropped to the level of domains not reachable etc. No server response basically. DNS updated, have removed McAffee, have removed some App's and limited App data usage... Sligtly better, but far from professionally usable. I'll look up if there's the "Killer" wifi service running somewhere...

I've noticed my Android phone still picks up DNSs and stuff even when the PC doesn't, so I have a suspicion it's not me, it's not the rooter, it is the mess of bad packets etc.

Anyways, this is where we end up when everything is run by servers, updates and AI. And that goes for Adobe too. Next time say it out loud - it's not a product, but a half-baked service.