Very low speed of copying files from camera to ssd

Question

Fujifilm X-T30 and Sandisk Extreme Pro 128GB SDXC Card 128GB 170MB/s V30 UHS-I U3
Average speed is 15.6 MB/s.
I am using a usb 3.1 gen 1 cable plugged into a usb 3 port to transfer the photos.  15.6 mb/s no where near what is neither advertised for this sd card nor usb 3 speed. What am I doing wrong? Maybe an sd card reader would be faster but are these speeds normal?

xenoid · Answer

There are plenty of possible bottlenecks...

The camera electronics
Your local USB driver
Your filesystem (on a full/fragmented disk things can take a lot longer)
Your disk (SSD or HDD?)

Personally I have always found that connecting to the camera was a lot slower than taking the card out and using a SD card reader(*). Currently using a cheap (€7) card reader from Amazon in a USB3 port of my PC, I get transfer speeds around 80Mbytes/sec to my SSD from a Sandisk Extreme 32GB cards.
(*) Another purpose of that routine is to swap cards in the camera to even out the wear over my set.

Very low speed of copying files from camera to ssd

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