I've been moving images from one machine to another all day today. Simple process. Export as catalog from laptop. Import from catalog on workstation. From the workstation, rename all images and move to the final folder. After a couple of hours and maybe 5 export/import/rename/move iterations, LR was running at a crawl. Activity Monitory showed 77 threads and 1.5GB of virtual memory in use by LR. This compares to 23 threads and 190MB of virtual after a reboot and restart of LR.
sorry i don't have any more details.
sorry i don't have any more details.