![]() Next can generate a placeholder based on the image but it requires the image to be imported statically. Next can generate a blurred placeholder image automatically or let us provide our own custom placeholder image. The temporary image replacement prevents the page content from jumping up and down, and indicates that the image is being loaded. Providing a temporary alternativeįor images, the temporary alternative is usually a loading indicator, a blurred version of the original image or an image of a lower quality. UPD: Uploadcare now has a Next.js Image Loader and Component. Unfortunately, Next.js doesn’t have a built-in integration preset for the Uploadcare service due to historical reasons but since it’s a good option, I decided to show you how to create a custom loader for the Uploadcare service in my next article. Next.js Image component supports a few cloud providers out of the box by setting the loader property of the component. you don’t need a performant CPU to process images and extended disk space to store them.a cloud provider may have more transformation options,.the image is served from the geographically closest datacenter using CDN network,.Sometimes it’s beneficial to use a third-party image service to transform and deliver images. You may check out the related example by running the examples project and opening CDN and image transformation services Others will be loaded on demand or, iGood news is that the image preload feature is compatible with responsive images. In the screenshot, we see that only two visible images are loaded on page load. Image preload with Next.js in Chrome Dev Tools In the screenshot below, mountains2.jpg which is located at the bottom of the page is loaded earlier than others because of the increased priority. Next.js Image component can prioritize loading the image through priority=. Sometimes you may need to preload the most important images in advance. Others will be loaded on demand or, in other words, when you scroll to them. Run the app and open the lazy loading example sunset1.jpg - 16.5kB - webp - 750x563 Since the lazy loading is a default setting for the Next Image component, let’s just remove loading="eager" to make it work. It’s not only beneficial for the end-user but it’s also good for the server because it doesn’t have to run image generation for images which might never become necessary. Next.js Image component enables lazy loading by default, meaning that the app only loads and displays the images which are currently on the user screen, reducing the amount of data which user downloads. To work around, I had to report the bug and switch to the CSS Grid container. I wanted to put Image components inside a Flexbox container to display them in a column but the styles conflicted and it caused the images to become invisible. While working on the examples, I noticed a nasty problem caused by predefined Image component styles. ![]() Only those four images which better fit my viewport size are loaded and displayed. I intentionally decreased and increased the viewport width, to test the responsive images. The golden rule of any performance optimization for me can be simply put as giving users what they want in the shortest time possible or providing a temporary alternative, for example, some useful information, an entertainment option or freedom of doing anything else while waiting for the requested result.Īs you see, Next adds image variants for each device size listed in the config, ranging from 600px to 3840px width. The golden rule of performance optimization Why bother about performanceĭo you know why companies spend thousands on performance optimization? The answer is simple - because the performance is directly correlated with whether customers give their money to the companies or not.Ī typical customer wants to get a service or product as fast as possible, and the site which satisfies the need faster than others gets more sales, signups, conversions, and, as a result, more revenue. And I will focus more on the practical side of image optimisation in the Next.js context. The terms are well-described by experts in the performance niche, for example in Addy Osmani’s book about image optimization. I will try to avoid all those trendy terms which the performance world is crazy about today, such as Core Web Vitals, Largest Contentful Paint, Cumulative Layout Shift, First Input Delay, etc. Check the docs for more info.īefore we start looking at the image optimization techniques which Next.js provides out of the box, let’s agree on one thing.
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