You have not stated what you are writing one to the USB stick. (If you have and I have missed it then sorry.)
USB sticks are normally optimised for writing tiny numbers of huge files onto the stick. (A couple of videos, a few dozen jpgs or mp3s or one big image when you are making a boot disk for Linux.)
If you are writing hundreds of files, the stick will spend most of its time mucking about at the wear leveling stage and not actually writing your data.
Real SSDs cost more and have sane firmware to get this kind of thing right.
Hi, I was using a single HD video file of around 1GB to test it. I actually got the stick replaced with another one but got no better results - around 5MB/s. I did run a speed test on it and got a write speed of 20MB/s but could not replicate that in practice.
As a comparison, I did just buy a Sandisk Extreme USB 3.0 and I'm getting write speeds of around 60MB/s
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