Is it really ARM though? Compilers have gotten good enough that they can outperform 99.9% of programmers. I guess if the game was full of intrinsics…
Apple though is notorious though for deprecating their APIs. They only support Core Profiles of OpenGL up to 4.1, and if the game utilizes Legacy OpenGL functionality, who knows what could go wrong there.
(You’re not even supposed to use Legacy OpenGL anymore, but tons of people do, because it’s fairly easy to understand compared to modern OpenGL. And modern OpenGL is significantly easier to understand compared to something like Vulkan.)