When developing a web application, there's a moment when you start thinking about its performance. The often reaction is to look at the code and try to find slow parts and optimise them. However, in a lot of cases, you can get a significant boost in performance not even touching the source code. During my talk, I'll show the most common performance bottlenecks of both back-end and front-end applications, how browsers and web servers work, how to utilise their features like DNS and HTTP caching, preloading or code-splitting, and what is Critical Rendering Path.

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