New
#11
As I'm sure you've already checked... the absolute maximum speed for USB 3.2 gen 1 is... 5Gbps, or 625 MB/s
Sitting here thinking about it... I notice you have a Samsung 860 EVO 1TB 2.5 inch SSD.
You could benchmark THAT in your computer, save the results, then temporarily mount it (if possible), in your external enclosure, and re-benchmark it. You should get pretty much the same results form that SSD, whether mounted internally or externally.
The top speed of the 860 EVO is like 550 MB/s which is less than the USB 3.2 max. speed of 625 MB/s, but very close, so it would be a good test tool.