When we asked for the task manager screenshot, we meant the 'processes' window rather than the 'performance' one, but this is quite helpful too. There isn't really anything off with your settings, so it's probably either you using the 5.0rc revision or some background program hogging all of your CPU time.
Also, you should maybe try switching OpenGL to Direct3D under Dolphin's graphics settings. There is the smallest of chances that you are actually running on your integrated graphics (instead of the GTX 770), and Direct3D lets you specify which GPU you want to use.
Also, you should maybe try switching OpenGL to Direct3D under Dolphin's graphics settings. There is the smallest of chances that you are actually running on your integrated graphics (instead of the GTX 770), and Direct3D lets you specify which GPU you want to use.