Slow response to printing on iMac Pro
Recently my iMac Pro has taken a long time to respond to printing. It takes a minute to load the print dialog, then another minute if I change the paper size, and again if I print to PDF.
My MacBook Pro (on the same desk) responds instantly.
The printer is also on the desk, but I'm using AirPrint. It is a Brother MFC laser.
What might be slowing down my iMac Pro, and how can I speed things up again?
iMac Pro (2017)