Sorry its not an answer to your question, but if you distrohop, take a look at Ventoy. One time write to make it a bootable system, then you just copy ISOs to the drive and you can boot them
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I think that's just hardware limitation. My USB2.0 sticks get 10MB/s and USB 3.0 get around 20MB/s
For faster stuff get a SSD with USB adapter
What's the write speed of your USB stick?