Since the latest LR CC upgrade this week (about 10/13/15), the navigation using arrow keys and mouse clicks is unbearably slow. Minutes sometimes. I have Windows 10. Seems to be a Lightroom thing - other apps, my browser work fine. What's going on?
We are sorry to hear about the issue.
Can you please try the following steps:
Reset Lightroom preferences by holding the shift + option (Mac) or shift+alt (Windows) while launching Lightroom.
Thanks, Sarika. I did your solution 1 and that took care of it. Before, when I tried importing, it took forever to navigate to the folder I wanted, and I could barely move from image to image. But then today, after importing, the navigation thing was affecting my general activity in the Library. So, I did your solution 1 and life is good again. Thanks so much.