Optimizing for the critical rendering path allows the browser to paint as quickly as possible, providing a better user experience and higher engagement. Understanding how a browser does this is important for developers building Progressive web apps as alternatives to Native Apps, because performance is your #1 feature. Using the Chrome dev tools, we’ll go through everything the browser is doing to get your site interactive. Let's review some public PWA’s and learn what we can do to keep our PWAs performing like Native.