Just updated, now sliders will randomly either not work/apply or take a substantial amount of time. This is not a computer performance issue, recent macbook. Sometimes the same adjustment will apply instantly, other times it will act like it didn't receive any input. Anyone else experiencing this?
Just deleted the update and reinstalled 5.5 and issue is gone.
My guess? Bad installation. I would redownload and reinstall and check it again.
I had the same problem, installing 5.5 made it go away. It was almost as if it was ignoring my graphics card.
Mac Pro 2012 12-core, 12GB RAM, Mac OS 10.8.5