The Wiki explains a Memory Split of up to 256 can be set and this is what I currently use on a Raspberry Pi 3. In the forum I see references to people using up to 320.
To get the most out of systems like PSX, PSP, N64 and Dreamcast, would setting a memory split of 320 improve performance for 3D systems and 2D systems?
My understanding is the CPU is used more in emulators, so is it really just EmulationStation that would benefit?
https://github.com/RetroPie/RetroPie-Setup/wiki/Memory-Split