I have a problem with file size. I have a iMac 27 5k with Retina, so I decided to create layouts @2x. If I want to create 1200px width graphic, I create 2400px in Photoshop - better view quality for me during projecting.
I have iMac 2015 Late with 16GB RAM, 3,5Ghz, 2GB Graphic, 256GB SSD and I notice that if I spend a lot of time on one .psd file, I start feel lags during scroll, selection, etc.
I also notice that .psd file which has 80mb, after opening in File info menu I see 1,2GB!...
Could you explain me what should I do? Is my workflow bad? I try to delete unneccesary layers, etc.