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PWA Directory: Loading content faster in the Application Shell.

Screen Shot 2017-07-17 at 9.40.21 AM
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When a user visits PWA Directory for the first time, a Service Worker is installed and the Application Shell is cached. On the following visits, the first render is accelerated by serving the cached shell from the Service Worker. Once loaded, the shell will issue a request for the page content and render it when the response arrives.