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I just set up a new OWC Thunderbay 4Disc RAID5 external drive. When I run a speed test on the drive I get: Write 1888MB/sec & Read 2600 MB/sec.
However, when I transfer files using lightroom from my imac SSD to the RAID, I'm getting really slow speeds of about 7MB/sec (transferring 66 photos x 58MB takes just under 1 minute).
I previously had a Drobo RAID and had no speed issues. Anyone have any ideas what is causing the transfers to crawl so slowly?
Imac: Mas OS Monterey 12.6
"when I transfer files using lightroom"
Do you mean you're dragging files/folders from one folder to another using the Folders panel? That's always been very slow, and there have been rare but persistent reports that it can lose files.
I (and others) recommend that you move entire folders using Finder and then tell LR their new location, as detailed in Option Two of this article: