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Message: <blockquote data-quote="RCanine" data-source="post: 6828629" data-attributes="member: 85040">What's the format? What reading program?If it's a PDF in the preview app, I notice that it's really bad at rendering huge images; what I think it does internally is paint pixels equal to the map size x the magnification, and stores it all in memory, then if that's more memory than can be allocated to the program, it needs to use swap memory, which is slow. In addition, if it's a vector map or has fonts embedded, your computer's going to have to do a ton of extra calculations rendering sub-pixels on the fonts.There's not a ton of things to fix this; it sounds like it's just pushing up against the computational ability of your macbook. Some things that might help are:* Slice the file into smaller images* Flatten the file in a JPG, or JPEG 2000 if you're short on disk space and don't care about interoperabilityThe real solution is to do something like what Google Maps does, and slice the information into smaller tiles and dynamically display what you need to at a given time, but that's more work than most people can put in.</blockquote>