nocache ‑ minimize filesystem caching effects
Once again I have to copy tons of files to a USB stick, and it's way too slow. It's a known effect on Linux systems.
Why filemanagers cannot recognize that, I don't know. It's be enough to copy files one by one (queuing) instead of starting all those operation all at once.
It also happens on the command line, but not so pronounced because one tends to do things more linear.
Next time it happens I will try this: