I havent tried any of the other PDF Readers, but I can tell you from personal experience that Ghostscript is VERY fast and not a resource hog like Acrobat!!

(Ghostscript 8.60) Approx 12MB https://sourceforge.net/project/showfiles.php?groupid=1897&packageid=108733&release_id=529280

(GSView) Approx 1.8MB http://pages.cs.wisc.edu/~ghost/gsview/get48.htm

Both programs are required to be installed and GSView is the frontend for Ghostscript. GSView is packed with features so give it a shot, it kicks Acrobat's ASS! (Well that doesn't say much though does it hahaha)