On all 3D-printer I have worked so far (even the Ultimaker), the print-speed is not limited by the head-movement, but by the maximum amount of filament the hotend can meld.
As far as I can see there is no way to specify this in Cura (other slicers can do this).
So I have to do the math by hand every time I change settings.
This is annoying.
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Example for a printer that can meld about 4 mm³ PLA per second:
60 mm/s speed, 0.15 mm layer height, 0.35mm extrusion-width → 3.15 mm³/s | O.K.
first layer: 0,3 mm layer height, 30 mm/s speed, 150% initial layer line width → 4.725 mm³/s | too much
I have to reduce first layer speed to 15 mm/s.