Smashing Magazine | Leonardo Losoviz

With so many JavaScript frameworks around, single-page application (SPA) websites seem to be all the rage nowadays. However, an SPA architecture has the drawback of having a slower first-page load than a server-based application, because all of the JavaScript templates used to render the HTML view must be downloaded before the required view can be generated.

Enter service workers. Through service workers, all framework and application code to output the HTML view can be precached in the browser, thus speeding up both the first meaningful paint and the time to interact. In this article, I will share my experience with implementing service workers for PoP, an SPA website that runs on WordPress, with the goal of speeding up the loading time and providing offline-first capabilities.

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