Scene AI is a feature the models visibility of surfaces to get maximum speed even for Out-of-core geometry.
Scene AI brings you much faster scene loading times, and a dramatic improvement in viewport interactivity. You are able to position and modify geometry in real time, even in scenes with several millions of triangles. Vertex animation with constant topology is updated in real time in complex scenes, as you move the time slider. Using the gizmos in the viewport on massive scenes is also in real time.