Dolphin, the GameCube and Wii emulator - Forums

shadowstepster Wrote:This behavior could be due to the way OSX renders retina resolutions at 1440x900 instead of true 2880x1800.

That doesn't really explain this behavior at all. The display resolution shouldn't have any effect on dolphins performance if he's setting the IR manually, especially such a drastic one.

The only explanation I can think of is that Dolphin's output is a filtered texture, and filtering does have a bigger performance impact if you're filtering the same image on a screen with four times the pixels. Running it in low-res mode gives you a 1440x900 image with no filtering (aside from what Dolphin does itself), so that's much less work.