A tile cache question

"Igor V. Melichev" <[email protected]> Tue, 17 Apr 2007 14:28:01 +0400
Newsgroups gmane.comp.printing.ghostscript.patches
Message-ID <[email protected]>
Ghostscripters,

Could anybody please explain why tile cache is 
coded as a property of the clist device ?
I don't like to create so many caches when creating
another clist device per each pattern.

Igor.