tturn off GPU acceleration... It actually makes things slower.
I compared LR CC trial next to 5.x standalone and i can tell that 5.x is faster.
on LR CC(6) When GPU is enabled (latest drivers) The brushes, with mask overlay, spot removal, zooming in and out is much slower. When i disable GPU they are faster, but still lagg behind 5.7.
One thing i noticed when i click System info on LR performance tab, on that little list it says GPU Device not enabled. Is LR using my GPU properly? GPU is HD7950(Tahiti, same as R9 280) 3GB
I post some screenshots.