I accidentally disconnected the power cord to my iMac, which of course turned off the computer. I think, but I'm not sure, I had LR CC open at the time. In any event, since then, LR barely works. It is very very sluggish, it takes forever to exit LR (which I've done a number of times) and commands take minutes to execute. This is not affecting any other programs on the computer. for example, it is not affecting photoshop. Any suggestions about how to make LR work well again??
Please follow the below steps.
Go to Lightroom > Preferences.
Click on Performance tab
Disable Use Graphics Processor
Restart the machine
Launch Lightroom and check for the issue
Also, could you please check and confirm the version of Lightroom are you using?
Which version of Mac are you using?
Let me know if this helps.