My lightroom has been very slow,locking up and ultmately crashihg I am using the current lifghtroom classsic and a mac pro with OS10 (latest update) I did recently have an eternal hardrive falilure abd had to reinstale all my lighroom files from a back up to a lacie RAID set to mirror my lightroom folders
Current Lightroom Classic on OS X? (OS 10) That's your problem right there. I doubt the current Lightroom Classic will run on such an old operating system.
Please give LRC version and exact version of mac os?
Try resetting the LR preferences:
Yes, but the OP said OS10, he didn't say OSX
The Apple naming convention for Mac computers changed from OS X to macOS sometime around version 10.11. The name for the current version of Mac's is macOS Big Sur v 11.2.1. the version previously was macOS Catalina v 10.15.x.
See the screen captures.