How long is a piece of string?
There are so many variables to this, only your own testing it going to give you an accurate answer.
Things like laminate and media thicknesses (cast vs. poly vs. mono are all different) as well as blade depth in the holder, age of blade all play vital parts to the equation.
I would take a stab at 130 and work from there if 85 is working at the moment. How slow is "slow"? We cut most jobs at 300mm/sec without any issues, nice sharp corners and smooth curves.