The original problem still persists for me on After Effects version 126.96.36.199 on OSX El Capitan.
Moving between frames with the keyboard sometimes takes up to 3 seconds for the preview to update, while dragging the playhead with the mouse pointer updates the preview instantly.
General realtime performance of all Adobe CC Apps tends to be sluggish.
Time to rewrite your UI engine from scratch with performance in mind, perhaps?
Same issue with me. They need to stop adding these unnecessary features in the UI. This is slowing down my work.
Both John Data and Maverick:
Your issue is not the same one as in the original thread. The cause of the issue in the original thread was fixed.
The symptom may be the same for your problem(s), but the underlying cause is different. Please give us much more information about your systems and the issues you are experiencing so that we can help you.