Well for me, PR1.2 made the lock screen swipe animation butter smooth. Scrolling in the Store is not smooth at all, but okay

and well my other gripe is with the alarm clock. When I swipe up, the animation is awfully jerky and the buttons can remain unresponsive for a few moments

the jerky swipe upwards has been around since PR1.1 and it's happening when someone calls you too. Actually that one should be fixed since it's one of the most viewed animations...might file an enhancement request one day for this.