Just installed the latest version of Adobe Photoshop and moved a few sliders in the RAW processing utility. I can feel the lack of power adjusting the image, but this was also present in my rMBP 13 from 2014. The wait to process the file to be used in PS also took a bit longer than on my rMBP 13, but still it was a close call. I wouldn't recommend anything lighter than the rMBP 15 to do serious work in PS, at least with big RAW files. Zooming and scrubbing is more than adequate. Even considering the photos are close to 80MB in file size. For the road and editing a dozen images a day, I would be a happy camper. My patience would run out pretty quickly if I was using the computer daily on a professional level, especially if you are editing between 100 -1000 shots per day. Right now the only option for this task is quad core CPUs, and they are yet to be found in smaller form factors. When you are working with big files from pro SLRS, Leicas or Hasselblads, you may as well invest in a Mac Pro or at least a 15 inch Macbook Pro. Space will also be a problem for those using this type of equipment, and getting a dedicated workstation will be the only solution in the end. If you use Photoshop or Lightroom with prosumer cameras or lighter, the new Macbook will be more than adequate, even the base model. Especially if you only do edits from trips, family and small business events. The only problem is the lack of SD card reader, which has nothing to do with the power of the processor. Browsing through my edits with quicklook after I have saved them to JPGs is a breeze. No lag, almost instant and I don't miss my old and more "powerful" rMBP 13. I may miss the SD card reader from time to time, but I love the futuristic downgrading, making me change me workflow to something better. Ran out of battery early this morning, used my rMBP 13 for a while, and I can't find an argument for keeping it. Selling it this saturday.