Claris CAD 2.0 will run very slowly with a Raster Ops GS 30 gray-scale monitor (with a GS 434 card) set to more than 16 shades of gray.
This information was provided by Claris Corporation on 16 March 1998, and incorporated into Apple Computer's Tech Info Library.
If you change the monitor to colors instead of grays, the screen redraw will speed up. If you set the grays to 16, it will be much faster. If you set it to16 colors it will be as fast as on a standard monitor.