It keeps up with the repeating keyboard easily. The old Macintosh can speed though the pages of this document backwards and forwards with the repeating PgDn and PgUp keys, and having fully rendered the entire document in memory at once, the screen fills faster than I can even perceive. ![]() So on a 12 year old Macintosh, I can do things impossible on a high end modern Windows box. It has zero difficulty with it using Apple's Preview, which being a 64-bit app comfortably allocates nearly 4 GB of RAM while this document is open. ![]() However my vintage 2008 Mac Pro 3,1 dual 2.8 GHz with 20 GB RAM eats this document for lunch. I've tried many readers under Windows 10, and none could handle this file. Even my high end Windows 10 Pro 64 bit PC with 24GB RAM 4.7 GHz 8-core FX-9590 with two Radeon HD 7990's dies painfully trying to simply view pages 9 or later of this document. ![]() I have before me a 52 page, 64 MB PDF file which cannot be handled by any PDF reader on any Windows PC since all the readers are 32-bit.
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