For much of its existence, JavaScript has been slow. No one complained until developers created complex web applications with thousands of lines of JavaScript code. Although newer JavaScript engines have improved the situation, there's still a lot to understand about what makes JavaScript slow and what you can do to speed up your code.

j vimeo.com/16241085

Loading more stuff…

Hmm…it looks like things are taking a while to load. Try again?

Loading videos…