Apple does not offer high-performance GPUs in any of their computer models. To get better performance from your Mac, you can use an external eGPU with a much more powerful AMD GPU with more VRAM.

Note: You cannot use an NVIDIA adapter in the eGPU. Apple no longer supports them.

You'll need both the external eGPU and an AMD adapter.

There is a VERY important, somewhat hidden setting you need to make in MacOS to get it to work at all.

Note: This is a “per app” setting, and the option will not appear unless the eGPU is connected, powered up, and has a GPU in it.