Immediately upon installing LR CC 2015 many of my functions using a Wacom Intuous 4 tablet have become jittery and slow. The crop frame wants to jerk around and keeps rotating with no input from me. It is difficult to cancel using Esc key. Slow and jittery also describes various brush operations, including Heal/Clone.
Am using the Yosemite Beta, but was also doing so with LR 5 (2014) and did not have any of these problems.
I'm having a similar issue on a Windows 8.1 machine, also using an Intuos 4, and a Bamboo Pen on our other machine. Not only are the tools jittery, but the pen will only "grab" sliders in the develop module about 20% of the time. This makes editing with a tablet near impossible. Any ideas what might cause this?