Portable Document Format (PDF) is the defacto file format for presenting device-independent documents on and off the Web.
Web Site Optimization: How To Speed Up Your Web Site By Minimizing Your GIF and PNG Image "Bit-Depth"
JavaScript can benefit from many of the same speed-optimization techniques that are used in other languages, like C1,2 and Java. Algorithms and data structures, caching frequently used values, loop unrolling and hoisting, removing tail recursion, and strength-reduction techniques all have a place in your JavaScript optimization toolbox. However, how you interact with the Document Object Model (DOM) in large part determines how efficiently your code executes.