I'm using Photoshop CC/Mac. For the past 2 days, I've been experiencing a major slow down when I use the crop tool. My images have either been 72 dpi ones I've uploaded from my camera to a 300 dpi 1" x 3" image. I've never had any issues before cropping -- it's always beenable to handle it very, very quickly. I've changed nothing on my end except cleared p-ram at start up. I've let it sit now for 35 mins while it thinks about applying my crop and it's only about 1/3 of the way through it. ???