I bought this with El Capitán, but being new into the mac world i made the mistake of upgrading to High Sierra, and since that moment the performance went down from 100% to 20%. The support people didn't help me becouse goes against Apple policy (they basically want me to buy the latest stuff, and i live in the 3rd world, here it's just too ******* expensive). Photoshop CC it's not available for Mavericks (Invision Studio works perfectly). Sierra makes Photoshop, Sketch and Invision Studio impossible to use, just too slow. I can't download El Capitan from the app store (not available for my OS) I have a MacBook Pro, Late 2013, 2.3 i7, 16GB, GeForce GT 750, Intel Iris Pro, OS X Mavericks 10.9.5 (13F34).
