Add in that the USB port on your PC, or your drive, or both could only be USB 2.x and that would make performance even more brutal.
FYI, I have an older generation version of the M.2 Samsung your "computer bloke" recommended, and it is wonderful. I'm sure you won't be unhappy with the other one either though.
If you had the space to move all Reaper related files off that external onto one of your internal drives (preferably your SSD, but you'll want plenty of space there for Windows to eat up) that might be a good test to help prove that's the issue.
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