I created a simple 'textBox' class, which has a Pfont as one of its properties.  Without thinking too much of it, I wrote a constructor that takes the name of the font as a string, then builds the Pfont in the constructor.  I found that with very few boxes on screen, I was running out of memory.  It turns out that Pfonts consume an extraordinary amount of memory, due to the .vlw format of the fonts.  The solution, of course, was to create some fonts that I want to use, then have the textBox objects simply point to the established Pfonts, rather than creating their own copies of the font.  While this is clearly the way it should have been done originally, it wasn't initially obvious that this was causing the problem.

Perhaps a warning regarding the size of PFonts would be useful in the Reference page for PFont or loadFont()...