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JavaScript, more than any other resource type, is uniquely positioned to be a massive performance bottleneck on the web. And it starts before we ever get into bundle analysis, or hydration or any other of a number of hot topics. It starts with the seemingly innocent script element. Tucked away within the way that element works is a lot of complexity and numerous side effects that can make or break your sites performance.
In this talk, we'll take a closer look at how to load JavaScript on a page and the multitude of ways that simple task can impact your performance.