Your computer is far too weak, but it's not impossible to run Twilight Princess full speed on latest revisions.
My i5 3570K plus the new Twilight Princess Speedhack in the patches section runs the game full speed all the time now, even in the most demanding sections. I'm using the latest versions of Dolphin. Disabling the Twilight Princess Speedhack, an i7 4770K should actually get full speed at 4.6GHz if the benchmark scales properly. From what I can test at various clocks of my own computer, it should.
My i5 3570K plus the new Twilight Princess Speedhack in the patches section runs the game full speed all the time now, even in the most demanding sections. I'm using the latest versions of Dolphin. Disabling the Twilight Princess Speedhack, an i7 4770K should actually get full speed at 4.6GHz if the benchmark scales properly. From what I can test at various clocks of my own computer, it should.