The tinyCam developer says, as a general rule, only 3-4 Wyze cams at a time will stream fluidly to a single ‘view’. My experience says three-and-a-half.
I haven’t used Wyze’ group functions with more than three cameras at a time since they first developed it, because in the beginning, with three, it was most stable.
Recently dumped a bunch into a group and it’s much more stable now, though only 3 (in portrait) or 4 (in landscape) are ever actively displayed and streaming at a time. 