Part of the obsession with building a great web site is that it’s fast. When you go to sites like Facebook, part of the marvel of it is that everything appears so quickly and seamlessly.  So when you do something like add advertisements or widgets to your site, it becomes a real drag when your previously zippy pages now take forever to load. The stakes are high: with each second a page takes to render, the number of people who abandon visiting your site increases. (more…)