It's the game's fault, more than likely.
By the way, if you have the 347.52 or newer drivers, there's now a "Dolphin Emulator" profile in them. There's a bug (or whatever that's called) that kills performance in 3D, taxing the GPU twice than what it should. I talked about that in the Stereoscopic 3D thread: https://forums.dolphin-emu.org/Thread-stereoscopic-3d?page=8
There I explained how changing a value in the Dolphin Emulator profile you can make 3D work only when it's enabled in the Dolphin options, and performance is corrected.
By the way, if you have the 347.52 or newer drivers, there's now a "Dolphin Emulator" profile in them. There's a bug (or whatever that's called) that kills performance in 3D, taxing the GPU twice than what it should. I talked about that in the Stereoscopic 3D thread: https://forums.dolphin-emu.org/Thread-stereoscopic-3d?page=8
There I explained how changing a value in the Dolphin Emulator profile you can make 3D work only when it's enabled in the Dolphin options, and performance is corrected.
CPU: Intel Core i5 4670k @ 4.4GHz
GPU: GAINWARD GeForce GTX 1080 Phoenix "GLH"
RAM: G.SKILL Ripjaws X DDR3 16GB 1600MHz CL7
OS: Windows 7 Ultimate x64
GPU: GAINWARD GeForce GTX 1080 Phoenix "GLH"
RAM: G.SKILL Ripjaws X DDR3 16GB 1600MHz CL7
OS: Windows 7 Ultimate x64