Please follow the below steps and let me know if this helps.
> Launch Lightroom
> Click on Lightroom > Preferences
> Click on Performance Tab
> Disable Use Graphics Processor
> Also Click on Presets Tab and uncheck the option Apply Auto tone adjustments
> Restart Lightroom and check for the issue
Let me know if this helps.
Following the most recent update my performance has gone to hell. On my MacBook it now take's 17 seconds or more (watching the color pinwheel) every time I do something. I disabled the new "Show Add Photos" screen that some have suggested, and restarted Lightroom.... but NO Improvement.
Please add your vote and details about the issue to this topic in the official Adobe feedback forum: Lightroom: CC 2015.2 User interface extremely sluggish and unusable. Be sure to include lots of details about what you're observing and the exact version of LR and OS X as reported by Help > System Info. (Flakiness in the Adobe updater often fools people into thinking they're running the latest version.)
Thanks for the suggestion..... But I still see the "Pinwheel" for more than 20 seconds every time I move the mouse or click on something!