I have the latest OS version, Mojave 10.14.6 (18G87) I did set the game on OpenGL. I tried setting the game to "software, diverted via hardware". Now it's running much better! Now that it's running better, I tried day and night cycle and lighting effects. But again the frame-rate drops immediatly.
I have just installed OpenRCT2 on my Mac (late 2013 Retina, 2ghz i7, 8gb 1600mhz ddr3, Intel Iris pro 1536mb) v0.2.3 "Tim the Enchanter I can't get the game to run playable, the frame-rate is so low, everything moves jerky. I tried lowering the resolution, bus this barely helps. Even on the lowest settings, my Mac immediately starts cooling. What can I do or check? I installed the game by downloading it from GOG, installing it via Parallels and copying files to my personal Mac programs folder.