50mm/s is only the max speed in this one example. In reality it can go faster.
2 cubic mm of filament per second is reasonable. The machines are tested at 8 cubic mm before shipping (that's too fast for a .4mm nozzle in my opinion - they push it to the limit).
I expect you are still not clear on this but you need to ask more questions if you don't understand yet.
By the way - to calculate the volume you multiple LXWXH or print speed X nozzle width X layer height.
So 50mm/sec is no problem at .1mm layer height like you chose but if you go to .2mm layer height now you are at about the limit that I like to print at (4 cubic mm/sec).
50 mm/s is the max speed of the head. The other one is the cubic mm of fillament extruded.
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