The speed of panning and zooming in 2D has been enhanced with a technique that takes advantage of objects with similar properties, and another technique that displays appropriate levels of detail at different levels of magnification.
When panning and zooming in real time in 2D, AutoCAD-based products automatically perform regeneration operations as needed. Normally, this operation is not noticeable except in very large drawings. In those cases, you might want to turn off the RTREGENAUTO system variable to prevent automatic regeneration.
When working with 3D models, navigation generates higher or lower fidelity graphical representations of the 3D geometry in some circumstances. The program's responsiveness when using 3D orbit, pan, and zoom operations has improved significantly by making use of multi-core processors. This improvement is most noticeable on complex 3D models using visual styles that render curved surfaces.
RTREGENAUTO - Controls automatic regeneration in real-time panning and zooming operations.