Frustration after the perfomed update was great beause the ROM is laggy and expecially the LockScreen reacts very slow. If you press the power button it takes quite a while until the screen wakes up and displays the lock screen.
But there are 2 settings which should be deativated in order to enhance the performance:
- Settings -> My device -> Smart Screen -> Smart Stay = disable
- Settings -> My device -> Smart Screen -> Intelligent Rotation = disable
After these changes in settings the device is not perfect but it reacts much more smoothly and decreases lags.
According to several sources Samsung is currently working on a further update bugfix these issues.