Edge problem after CU upgrade. Could someone confirm or otherwise.

Still all good. Second boot of the day and being going around 45 minutes now. Lots of opening and closing of tabs. All super rapid just as it used to be......

I'm going to mark this resolved (again). The router reboot inexplicably appears to have fixed the issue. Why a clean install should have been affected as well as the upgrade install I have no idea, but it appears that it was.