Slow speeds while doing backups

I do some large backups sometimes, and I use a laptop with Thunderbolt ports, with USB 3 external drives. Takes about 90 minutes for a 300GB backup. Speeds are about 55MB/s.
Is that fairly normal, or can I get better speeds with better cables? I use the cables supplied with the drives, with a USB to USB C converter. Tried with a [cheapo] dock and speeds are about the same.

Suddenly speed goes up to 111MB/s, but that is one fourth of even USB 2 speed?

These are the speeds [middle
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pic] Screenshot_23.jpgScreenshot_24.jpgScreenshot_25.jpgone is supposed to get. Why the heck are my speeds so low?
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