I’ve been a big fan of the Pragmatic Bookshelf series, in particular their monthly online magazine. The magazine are downloadable in PDF, .mobi, and .epub formats, and browsable online in HTML format. Browsing through the latest couple of issues, I noticed a distinct slowness as some of the images were downloaded. This is usually a hint that a high resolution image is being referenced, but being “cropped” down to a smaller size with the height/width attributes in the HTML. For example, see this story about Ruby Bundler and look at the red ribbon image. The source image is 693×693 but…