![]() ![]() ![]() On the other hand, if you evaluate the JavaScript on the server and then send over the HTML (server-side rendering), then the initial request will take longer to load while it waits for this server-side evaluation.īecause Gatsby does server rendering during the build process (rather than when a user is loading the page) a Gatsby site will return HTML immediately without waiting for server rendering, and then the client’s browser can start loading images as soon as it receives the HTML. If you send over React JavaScript files to be evaluated by the browser (client-side rendering), you can’t start loading images until the browser evaluates all of the JavaScript to figure out what images you want to load. When you’re building a website with React you face a bit of a catch-22 for optimizing image loads. Fetch above-the-fold images immediately Avoid hydration lag for React apps Here, we walk through the question of why these benefits matter, from a user’s perspective, and why providing them without Gatsby Image (or something similar) can be difficult. We provide a detailed guide on using Gatsby Image in the How To section of this documentation. We built Gatsby Image to provide these things - a higher-level building block that has the richness users expect, with the API simplicity developers love (and without maintaining your own image processing pipeline!). There are a number of ways, from cropping overly large images, to using newer file types, to reduce image file size. Minimize image file size to reduce request roundtrip time. “Progressive images” are image placeholders - previews of a full image that hold its place during page load time. Provide a placeholder during image fetch. This means doing the work necessary for showing users the images they’ll see on page load - and only that work, to avoid resource congestion. ![]() There are three basic principles of delivering an optimal image loading experience:įetch “above the fold” images immediately delay other work. One important part of overall page loading experience is image loading. A delay of 100ms is associated with a 3% increased bounce rate. When visiting new pages, users expect pages to load near-instantly, with a smooth experience. Our visual standards for what we’ve come to expect have risen - a lot. The web has come a long way since 1995, when syntax was invented. ![]()
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