For FSR to work best it has to be built into the game. There are ways to make it work without it but it’s not as good.
So to upgrade to later versions the game developer has to do it.
Tho unlike Nvidia’s DLSS FSR doesn’t use dedicated hardware and you can run it on basicly any modern GPU.
Did Apple allow JIT or is it using interpreted CPU emulation? Because if it’s using interpreted emulation then the performance is gonna be realy bad.
Edit: I actually checked and it’s using interpreted emulation. Interested to see the performance impact.