I just upgraded my Lightroom 5.7 stand-alone to Lightroom CC and it is much slower. I have a good laptop that is less than three years old, with 8GB RAM and a SSD. What's up? Thanks in advance!
Try disabling GPU acceleration in your Lightroom preferences and see if that makes a difference.
"Use Graphics Processor"? I just unchecked that and restarted LR and so far, it seems to be running faster. Thank you! But, why would that make it run faster??