Extremely high latency with home internet

I still wonder if something else is going on with your set-up.  Like I said, I don't game….and gamers have complained about latency on TMHI (not as bad as Starlink, though).  I wouldn't say I'm a "lightweight" user though by any means, and I've had a household of millennials doing "remote work" and honestly haven't had any problems.  Speedtest didn't even report upload and download latencies until recently, so it is hard to form an opinion on what is really required.