Recent Jmol versions can display antialiased images which are much nicer (smoother).

However, this may impact (x 2?) display performance.

For the moment, keep antialias=off as the display default, but provide a toggle control to turn it on.

Consider making antialias=on the default if end-users request this.

http://jmol.sourceforge.net/faqs/#I%20see%20jaggies.%20Why%20aren%27t%20the%20graphics%20anti-aliased?