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I need to mention to you that lots of these SATA to USB adapters offer mediocre transfer speed, even on USB 3.0 ports. SSD's typically run 400-500MB on a decent SATA port on a motherboard, even lower cost models. Some may drop speed if you transfer great amounts of data - many gigabaytes.on a laptop you need an USB-to-SATA connector.
I tested several of such SATA to USB 3.0 adapters - most run at 30 - 50 MB/sec only, I found one little adapter card - SATA to USB 3.0 which was used in an external drive case, this one as the only one does 150MB/sec both for R/W. So if you think your SSD is slow it might rather be the adapter slowing down the drive.
And I found as well wide speed variations on USB 3.0 hubs - between 30 - 500 MB/sec with different models.
I'm using a little benchmark routine Atto Disk Benchmark, but there are some similar routines available as well
https://www.atto.com/disk-benchmark/
https://www.techpowerup.com/download/atto-disk-benchmark/
You just cannot assume that hardware specified for USB 3.0 or 3.1 or C port is actually giving you the speed these standards specify