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You can reclaim "semi-permanent" virtual memory in PostScript as follows:

serverdict begin 0 exitserver
$$SAVE save def

download any dictionaries, fonts, etc., here

CTRL-D

The information you downloaded will reside in memory until you restart the
interpreter (power-cycle the printer or systemdict begin quit) or until you
do this:

serverdict begin 0 exitserver
$$SAVE restore
CTRL-D

Which restores the VM to the state that it had before the previous save.
Note that you can't do this inside the server loop, as the server looses
control when the job finishes and the interpreter will restart itself.

Pat Wood
Editor, The PostScript Language Journal
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