Dolphin, the GameCube and Wii emulator - Forums

why is d3d11 so slow compared to d3d9? is it my gpu nvidia 9600gt?
for instance smg2 on intro menu with d3d9 i have 82fps with d3d11 50fps

It´s slower because it doesn´t skip the graphic effects DX9 does and is way more accurate than DX9.

It's actually mostly slower because VideoCommon had so many goddamn workarounds that were needed for D3D9 that only slow D3D11/OpenGL down. Plus, buffer management is the one thing that D3D9 is better at, and buffer management is pretty important for Dolphin. There's a workaround for that (a state tracker that avoids unnecessarily updating buffers when the data hasn't changed) in the works.

For me, OpenGL and D3D11 runs faster, with the same configuration from D3D9, no Idea why, btw, you should use which one runs better on your system.

This is a moot discussion anyway, as D3D9 has been removed from the emulator.