I have to state that typically, I am usually at least one Mac OS behind the latest and greatest, usually choosing stability over new features. That has worked out well for me. But, there were some improvements in FCPX 10.5 as well as some plugins that required a move either to Catalina or Big Sur. I decided I would just do a clean install and go to Big Sur. This has been a nightmare.
System Specs
RED has acknowledged there does seem to be an issue with RED R3D files when using combo of FCPX 10.5 and Big Sur. Lots of freezes, beachballing, lagging, etc. when you have R3D files in project. I thought perhaps this was limited to slow hard drives, but have since tested on external SSD and seeing problems on my MBP as well. Overall, everything just seems unstable. Thinking about going back to an earlier version unless others have had success with a similar configuration.
As for storage, I run OWC Thunderbay RAID 5, Oyen Digital SSD, etc. Not the fastest storage but has been totally fine with previous versions of FCPX and Mac OS.
I'd appreciate any feedback that might help me put the pause button on going back to Mojave.
Thanks!
Steve