Slow wifi, but on only one connection

Recently reinstalled Cachy OS w/ Plasma, with everything going fine with setup, until my wifi (xfinity) slowed to a crawl - like measured in kbs…

After restarting the connection, rebooting, restarting the router, the issue persisted. Tried the other computer on the same wifi and it’s fine. Then I tried my phone’s hotspot and it’s fine. So, apparently, it’s just the xfinity wifi on this setup (no issues with wifi speed on it prior to reinstall.)

I’m not very linux-savvy and am at a loss as to how to proceed from here. Posted on the Cachy support forum as well.

Well can you find the technical details of your connection, signal, security, speed, frequency.
That’s all in the network applet click on your connection see Details, there is a graph also.
You can share a screenshot of this (blur/mask the IP adresses).