Hi Malicone
Performance issues after a patch are generally down to either a misbehaving addon, or an interface file that hasn’t updated properly. As such, first thing I’d suggest is a full User Interface Reset to clean everything out, and give us a good baseline to see what’s going on
As for the Flickering, that’s being looked into, and I’ve already been discussing it over here so I’d suggest going through what has already been suggested in there first, and follow up in that thread with the results of that