Judging from the sparse information you have provided in the thread, your problem could be anything, or even invalid.
Provided your PC is fast enough to run the game fullspeed (60 V/Is for NTSC and 50 V/Is for PAL), the actual in-game frame rate is supposed to be 20 FPS (frames per second) for NTSC and ~17 FPS for PAL in Ocarina of Time, as it was on the real console.
If your PC isn't getting fullspeed (thus reducing the framerate), then you need to upgrade your PC so it meets the minimum requirements or use another emulator or plugin that has lower requirements.