HP LaserJet Pro 400 color Printer M451 series - Manual (Page 150)

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 product is turned on.
● Send permanent resources to the product only at the beginning of a print job and not while the
product is printing.
NOTE: Overusing permanent resources or downloading them while the product is printing might
affect product performance or the ability to print complex pages.
132 Chapter 10 Manage and maintain ENWW