Extruder max feedrate (no replies)

Hi guys

I'm been thinking about max feedrate of extruder

From what I understand max feedrate is classed as the physical limit of the printer

From what I can work out the default on marlin fir extruder is 45?

So o me this means my extruder will not run quicker then 45mm/sec

So if I open printer face set to extruder 10mm at 90mm/sec it will just go at 45mm/sec

Am I correct?

I want to print o faster then 90mm/sec in slicer what should. Have as max feedrates?