I have had the same issues. Slow all round performance, sometimes painfully slow, apps sometimes freeze or crash. Not as extreme as others have reported (flickering screen, interupted calls etc), but today phone switched itself off and on by itself (battery nearly full). I first installed via update service on phone; then tried update via SUS and did a factory reset. Not much improvement, so I am not convinced that helps. If I had the choice again I would not install this version. .
