Printing speed slower than it used to be on MF6632cdw

[Wilfred]

Somewhere along the way my MF632cdw started to print pages much slower.

I know that when I change the paper to coated or some other settings it will slow the speed to print better etc but if I am just printing a bunch of pages it is now always printing at that low speed

How do I change the default back so that on regular jobs the speed is back?

Thanks in advance for your help

Fred