I just bought a new MacBook with the highest specs (3,1 Ghz, 16 GB 2133 Mhz LPDDR3, Radeon Pro 560 4GB). When adjusting rendering to the lowest settings I get a framerate of 50-60 fps. However, all the knobs and buttons in both default and addon planes react with a delay of 5-10 seconds. I used to sim XP 10 and 11 on a far inferior laptop (2,6 Ghz, 16 GB 1600 Mhz DDR, NVIDIA GeForce GT 750 M 2048MB) and never had any problems of this kind, so I'm confident it's not due to insufficient hardware. Every other function of XP else works just fine.