Thanks. I am recording more data but this is a preview. Two computers sitting side by side on the same AP.

One showing "network saturation" and the other with rocking ping times.

And for background this is on a small commercial Unifi system where each AP should be able to handle >200 clients and there are perhaps 8. The two computers are on the same AP but there are six of them available. There is 6-8 Mbps total network activity on a 400 Mbps account (that tests that fast wired and >200Mbps WiFi). I am baffled.

Older computer:
https://share.pingplotter.com/EcJ5kuN6cAk

Newer Computer:
https://share.pingplotter.com/arbSsQU51Ms