Fwiw..

My large cnc mill bed is 240 kg in mass, for the bed alone, and up to 100 kg of vice and workpiece, easily.
So 340 kg++ of mass.

Worked fine with one small nema 23 stepper of 3Nm.
48V, 2M542 drive.
1:3 HTD belt drives.

Heavy is better, not worse.

For non-commercial use the speed was never a concern.
I never needed higher speeds.
Always wanted more mass, more rigidity, more resolution ...
leading to better accuracy.