Our business is in the building industry. We have many clients who have moved to electronic delivery of architectural plans. Some clients send us huge PDF files (50 to well over 100+ mbit) containing hundreds of 42" x 36" (native size) pages. On our WinXP 32 bit machines, even maxed out with ram (some 2gig, some 3.5gig, some single, some dual processor) the computer "chokes" on PDF files this large. Scrolling and page cycling are like watching paint dry. Often Adobe Reader just freezes. I presume this is caused by the system paging to virtual memory since the computer cannot load the entire document into memory. Has anyone tried using a Win7, 64 bit computer with gobs of ram in an effort to resolve that issue? If so did it work?