Good thread -
I've about 40 or so Wyze cams on 3 sites/routers. One site with 10 cams is on a decrepit ISP, I get about 6Mbps down/0.7 Mbps up on a good day. When I try to view remote if I try and pull up more than 2 cams it's iffy. The app often tells me to choose a lower resolution.
BUT...