Anyone have any views on what sort of speed and acceleration i should be aiming for?

Bearing in mind it has a relatively low spindle speed, even in aluminium, the feed rates are pretty low, I don't think it's worth going much above 2500mm/min?

I have read that there is a point in acceleration where Mach starts rounding corners etc, is this a known point or just something that can happen at some setting value?

Its currently set for 1000mm/min but that seems quite harsh when you do a rapid, it makes the machine shake a little at start/stop of the move.