JavaScript is one of the most important programming languages, because so many Web sites include it on the client side (and sometimes on the server side).  This means that the optimization of JavaScript programs is a problem that, when solved, can affect a large number of users. In this talk, Marija Selakovic points to some of the low-hanging fruit in the world of JavaScript optimization, demonstrating techniques that work just as well, but can massively affect program speed and efficiency.