On MacPro with recent El Capitan upgrade, Photoshop 2015CC prints 5-6, maybe 10 times slower. CS6 is the same. Other applications print OK. Adobe Creative Clous update didnt help. Apple Software update didnt help.
What printer brand and model are you using?
Have you checked with the printer maker for updated drivers?
Photoshop didn't change, but the OS print code did, and possibly the driver code. I haven't heard of this problem from other users, so it is most likely specific to your printer brand and model driver.