Adjust the navigation speed interactively
You can move faster or slower as you navigate around objects using the arrow keys. For example, you may want to increase the navigation speed as you move around a large object such as a car, but decrease it as you navigate around a small object such as its rear view mirror.
Set a default speed for walking and orbiting
The Scene Settings window appears.
These values determine the initial speeds when you open a scene. You can change these initial speeds at any time by pressing the + and = (+) keys.