I am starting to review my TinyG configuration settings of the upgrade and I noticed that the c-beam screw drive max feed rate is a lot higher than the XC.
6000mm/m Max, 1500mm/m recommended.
For the X axis this will be a significant slow down from 8000mm/min.
But a big speed boost for the Z axis from 500mm/min.
I have noticed that cuts with a lot of Z axis movement were slowed down by this limitation.
I had been avoiding spiral cut smoothing strategies on my profile cuts for this reason.
It will be interesting to see how the increase in Z axis speed offsets the loss of X axis speed.