Jan 16
Loading video player...
Most frontend performance problems don’t come from huge apps or slow devices. They come from small decisions we make every day. A render that didn’t need to happen. A request that ran too early. A piece of JavaScript doing work when the browser was already busy. Your code can be 100% correct and still feel slow. And users notice that delay even if they can’t explain it. In this video, we break down what performance optimisation in frontend actually means. Not tips. Not hacks. But a mental model for understanding why things feel slow and how to think about fixing them. We’ll talk about: What the browser really does when a page loads Why blocking the main thread hurts user experience How unnecessary JavaScript, network requests, and renders slow things down Why performance is about perception, not just speed The core questions you should ask before writing any code We’ll also build a clear roadmap for frontend performance: How browsers work Loading performance Rendering performance Runtime and interaction performance Data, caching, and perceived speed This video is the foundation. Everything else builds on top of this way of thinking. If you care about building frontend applications that don’t just work, but feel fast, this series is for you.