Now when panning and zooming in 2D, AutoCAD will automatically regenerate the drawing for faster and smoother performance. Linking to content is possible from the web and mobile version of AutoCAD. Now the block library is available to you anytime, anywhere. You can now compare versions of an external reference file (Xref) and make changes without leaving the current drawing. Using the drawing revision calendar, you can compare previous versions right in the context of the current drawing.