> macOS Due to macOS not supporting Vulkan and other stuff required for Proton, it's been on the backburner for support from Valve for a while. Portal 2 can't

> macOS Due to macOS not supporting Vulkan and other stuff required for Proton, it's been on the backburner for support from Valve for a while. Portal 2 can't even run on macOS anymore since it is 32-bit only. Most games work how they would on Windows when running under Proton vs a native port, you should try it on a Linux machine when you have time.