The SSD enclosure in the Stand & Hub for Mac Mini / Studio connects at USB 3.2 Gen 2, so it reaches up to 10 Gbps. NVMe speed ratings are usually measured with the drive installed directly inside a computer, so an external enclosure will show lower numbers, which is expected.

To get the best speeds:

1. Format the drive as APFS or ExFAT.
2. Make sure the hub is connected to a Mac port that supports 10 Gbps.
3. Avoid heavy read and write activity on the other ports at the same time.