Did not have the problem before 2.9.
Since I keep seeing folks saying this was a known issue at release, then I'll simply assume a lot of these "issues" were known and they released it anyway. So I'm out of this thread.
Since the 2.9 update now external graphics have a shaking / shuddering effect going on. RTX 4070 with ver 537.13 first, then updated to latest 545.84 GRD. Getting the same result.