Dolphin only runs on one CPU, on two threads. As for your video card, read this: https://forums.dolphin-emu.org/Thread-minimum-specs-video-card
Try these to run faster:
1) Update drivers, Windows updates, DirectX Web updater, and latest version of Visual C++ (some components may be missing)
2) Make sure under Power Management in Windows you're running in High Performance. Also, make sure you have a high performance profile set in Nvidia Control Panel
3) Use the OpenGL backend on one of the latest dev builds, as it is faster than D3D. (Depending if you're sticking with Nvidia, you should use Vertex Streaming Hack (for Nvidia cards only) on the Master builds, but it's not needed on the latest dev builds due to some updates in OpenGL extensions for AMD and Nvidia cards)
Try these to run faster:
1) Update drivers, Windows updates, DirectX Web updater, and latest version of Visual C++ (some components may be missing)
2) Make sure under Power Management in Windows you're running in High Performance. Also, make sure you have a high performance profile set in Nvidia Control Panel
3) Use the OpenGL backend on one of the latest dev builds, as it is faster than D3D. (Depending if you're sticking with Nvidia, you should use Vertex Streaming Hack (for Nvidia cards only) on the Master builds, but it's not needed on the latest dev builds due to some updates in OpenGL extensions for AMD and Nvidia cards)