With video - Windows Explorer (Windows 10) unusually visibly lags when displaying files in a folder

Watch this 13 second video - https://youtu.be/lCKmAwWPxqQ

Those external drives are part of a pool using Stablebit Drivepool.

3rd party Explorer apps don't do it, so I don't think it's the pooled drives.

How do I fix this?

I added some new 28TB drives to a USB-C 3.2 Gen 2 external enclosure (Terramaster D4-320) that performs very well. I move a bunch of files to it. In my media folders, whenever I go to a folder my PC has not opened before, Explorer seems to look at each one slowly and then flashes them back on the screen. It takes a while.