The Windows 3.1 PostScript driver encloses each page in a gsave/grestore pair to restore the graphics state (reclaim memory) without deleting downloaded fonts. Also, the driver now calculates memory consumption during the course of a print job, and will flush downloaded fonts at the start of any page if memory is low.
Users can modify this behavior by setting the Printer VM and the Per Page Font Downloading options in the Advanced Options dialog box. The Printer VM option specifies how much available memory is in the printer. The driver uses this setting when calculating memory usage. The Per Page Font Downloading option directs the driver to flush printer memory at the end of every page regardless of how much free memory exists. Essentially, this option forces the driver to downloaded fonts with each page.