Guys, thank you so much for all the great ideas. Given that everyone made a big effort to help me, I'm a bit embarrassed to report that it looks like it went away? I tried rebooting before and that didn't help. I rebooted a second time for an unrelated reason and that "fixed" it. I have no idea why. I feel like an idiot now. I will report if it comes back, but, for now, I think that was solved.
Thanks!
I've played Xcloud on a good wired connection. It's impressive but IMHO opinion far from ideal. Input lag is getting better but it's still noticeable. Resolution varies but it's never as good as the real thing. Noticeably worse, actually. Loading a game takes longer than locally. For me? It's not enough. That said, before I was around, my mother-in-law spent years watching everything on the wrong aspect ratio. On a good TV. So I can totally see a lot of people streaming games for years without realizing how much better gaming can be.