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?
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.