It is well worth reading if you use a Mac. A Mac user tells us that the latest Apple laserwriter drivers let you save output in reasonable ps formats. They are available free of charge from Apple. This is supposed to allow a very crude approximation to the PostScript file to be rendered on screen when viewed in a non-PostScript viewer. This preview is low quality and should be superfluous for figures submitted to the archive anyway.
Previews are easy to find and eliminate.
Note that the savings can be considerable. One recent example had two figures with preview bitmaps. Removing the bitmaps made the file much easier for readers to download. But the problem was with the equation editor I used, Waterloo Maple's Expressionist ver.