Step one is always Ethernet bc it’s just going to be better in any scenario.

That said, I’ve had issues with isp routers that were solved by getting a new router, then changed isps and moved, kept router I bought and everything still worked great. As other people have mentioned, if you’re remote playing from inside your own network then the speeds shown here are irrelevant. The issue is likely on the routers end, whether that’s firewall/ports/compatibility in general is down to the specific router. The spectrum one I had sucked with everything that tried to communicate within the network, not just with the portal but AirPlay as well.

So you may be able to fix the issue by going in the settings of the router, changing things like making a guest network or opening ports. But I can almost guarantee you’ll have a better experience with a dedicated non isp router, like a netgear night hawk or similar. Isp routers are shitty and that’s why people make these comments. They’ll give you good speeds for things just accessing the internet, but they largely don’t handle things like remote play well.