As the world build sites that are more heavily reliant on JavaScript, we sometimes pay for what we send down in ways that we can’t always easily see.
Addy Osmani explains how and why JavaScript is the most expensive resource your site uses today—especially on mobile. Addy also shares tips for fixing JavaScript performance issues so everything loads quicker. A little discipline can help if you want your site to load and be interactive as soon as possible on mobile.
Addy is an engineering manager with the Chrome team at Google working on web performance. His day-to-day job is leading a speed team focused on trying to get pages on the web loading and running smoothly. Their projects include Lighthouse and Workbox. Addy is the author of Essential JavaScript Design Patterns and the recent Essential Image Optimization guide.
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