Display improvements for the Draft environment include:
Faster crosshatching in drawing views.
Faster display of 2D geometry. For example, a block may display as a rectangle during a view operation such as pan.
Faster file open display by changing the default value for Enable "Undo All" for profile/sketch modifications setting to unchecked.
The option is in the Solid Edge Options dialog, on the General tab. For more information see the help topic, Undo All command.