Below are some points that are important in order to be efficient when working with imported drawing Cad information.
When working with imported dwg, dxf or sat files, remember the following:
Always turn off the layers that you do not require.
Working with the drawing (such as zooming in/out in the drawing area) will be much faster if you explode the drawing.
Crop larger Cad drawings to get rid of unnecessary drawing information.
Only convert entities that you require.