I can confirm that this bug exists with an Intel card but not NVidia. Also can confirm that running with UXA eliminates the problem, but that causes frequent system hang/crashes.
I also tried upgrading from the Beta with the Ubuntu Edgers repo enabled but that produced no change in behavior. UXA continued to cause system hangs and performance without UXA enabled remained sluggish.
I can confirm that this bug exists with an Intel card but not NVidia. Also can confirm that running with UXA eliminates the problem, but that causes frequent system hang/crashes.
I also tried upgrading from the Beta with the Ubuntu Edgers repo enabled but that produced no change in behavior. UXA continued to cause system hangs and performance without UXA enabled remained sluggish.