Yeah, those GameCube games are definitely not graphically demanding at all. They're CPU-demanding, unfortunately, as emulation is pretty taxing. Dolphin 5.0, which was released a few months ago, is much faster and better than its predecessor, which is nice.
Star Fox Assault is another game that runs pretty nicely at 60 FPS, though there are some levels where it's locked at a really jarring 30 FPS. The widescreen hack works, but it occludes everything on the sides on some levels.