I have a mesh connection for my PC. I play Fortnite and everything is fine for now, but when my brother is in my room and streaming videos it just starts to lie. The ping rises. You can hardly build anymore, except for a few exceptional moments. You should know he also has a mesh repeater in his room and the repeaters are connected in series. For me it is always the case that even when I put on a YouTube video, it starts to lie. We currently have a Vodafone 400k line.
That with your 400k line has nothing to do with it. The Internet is currently quite busy in the corona era. It's probably because of it. Before the corona period I had a 4-5 ping now I have a 17-20 ping.
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Maybe you should connect your PC with a network cable if possible. WLAN only if there's no other way and use it very sparingly!
I have Lan.
Just because you wrote you used a mesh connection, that would be Wi-Fi
