640K of program memory is an awful lot.
The default setting uses 32kb
People often use 64kb - I am currently running at 256kb (262144) which seems to be a reasonable tradeoff.
A little poking around with google shows that this setting is used by the os to cache fonts as they are rendered:
http://msdn2.microsoft.com/en-us/library/ms900737.aspx
Quote:
The value specified for the limit is the size in bytes of the glyph cache per realized font. This number is automatically multiplied by 4 for antialiased fonts.
A realized font is any unique combination of font, height, weight, and effects (for example, outline or emboss). A font is realized the first time an application uses it for drawing, and is unrealized when the application deletes the HFONT.
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Note that's per-font! So setting this very high can eat a lot of memory when running PIE, with multiple fonts.
So, going crazy with this setting may not be a good idea
