Problem
When you fit the model to a specific point, the zoom to fit appears choppy, rather than smoothly navigating to the point.
When you fly in a 3D model, the model constantly redraws as it is flying, rather than smoothly navigating to the point you are trying to see.
Solution
You can disable the Motion Fly-To feature in the user options to improve your experience.
For more information, see Change my preferences.