Why FPS should I be getting with Skyward Sword?

[Shonumi]

OpenGL as an API is consistently and frequently updated by the Khronos Group, and it's a pretty major API on just about any platform these days (especially mobile). Strictly speaking about Dolphin, OpenGL is always being updated as a backend. It's not like it's some old plugin that no one's touched in years. Just last year Dolphin overhauled the OpenGL video backend (the GLSL merge between 3.5 and 4.0). Direct3D11 has usually been the slowest backend, though it was a toss-up for some systems on some games between OpenGL. Direct3D9 was the fastest, probably only because it was also the least accurate (it's been removed in the latest development revisions). OpenGL has been worked on enough to the point where it's generally the fastest option for most people, although some people still don't find this to be true.