Apple didn't really change the 2015 model, but they stopped selling the top-end model with the Radeon GPU. I've bought the Radeon model used last year and I'm a

Apple didn't really change the 2015 model, but they stopped selling the top-end model with the Radeon GPU. I've bought the Radeon model used last year and I'm also having performance issues. Maybe it's partially an issue with High Sierra in general? Just yesterday I had to reboot because the macOS window manager crawled to a halt. IntelliJ IDEs have become much slower on external HiDPI screens too. As much as I love the 2015 model, I've started moving some workflows to a boring gaming box running Linux. It's amazing how easily NVIDIA cards can push those pixels.