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External Storage Really Slow?

L

loybond

macrumors 6502a
Original poster
Aug 1, 2010
857
632
The True North, Strong and Free
On my iMac 5K (2017) my USB-C connected 1 TB NVMe drive would do 900/930 MB/s write/read on Catalina. On Big Sur, it got down to like 30 MB write speed.

I took that same drive, formatted as APFS, and connected to my M1 MacBook Air, I'm getting 15 MB/s writes. Best read is 500 or so. Anyone else experiencing this?
 
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