HP LaserJet M4349 Multifunction Printer series - Manual (Page 267)

Save resources (permanent resources)
Utilities or jobs that you download to the device sometimes include resources (for example, fonts,
macros, or patterns). Resources that are internally marked as permanent remain in the device memory
until you turn the device power off.
Use the following guidelines if you use the page description language (PDL) ability to mark resources
as permanent. For technical details, see an appropriate PDL reference for PCL or PS.
● Mark resources as permanent only when it is absolutely necessary that they remain in memory
while the device power is turned on.
● Send permanent resources to the device only at the beginning of a print job and not while the device
is printing.
NOTE: Overusing permanent resources or downloading them while the device is printing might affect
device performance or the ability to print complex pages.
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