what what speed you use share experiences
This depends on soooo many things. RPM of spindle. Size of bit. Number of flutes. Material you are cutting. How stiff your MPCNC is. Depth of each pass.
But as an example, I use a Rigid R2400 at 20k RPM, 1/8" down cut dual flute, 1/8" depth of cut, on a 24"x48" MPCNC with mid span supports, SS 1" tubing, in 3/4" plywood, at 1100mm/min.