To fix this, make sure the polyfills are only offered for people using old browsers. Although this is a good idea, it may lead to lots of unnecessary javascript being downloaded for people using modern browsers. They'll use polyfills for this: code that servers as a fallback for old browsers to do things that would otherwise not be possible. Good developers try to make websites accessible to large audiences, including people who use old browsers. Avoid serving legacy JavaScript to modern browsers More and more browsers support this.Add the loading="lazy" attribute to images that aren't directly visible when loading the page, and you'll see a big performance improvement. With the introduction of the loading attribute, this has become a lot easier. Until recently this could be quite challenging for the technical team and required external javascript libraries. Lazy-loading lets the visitor only download the images that are shown directly, and while scrolling down, more images will be loaded. Say you have a large page, with lots of images shown below the fold: not directly visible on the visitor's screen, but only after scrolling. The more common term is lazy-loading images, which means not loading an image until it needs to be shown in the browser (or right before that). Although the impact on page speed is likely not huge, it's low-hanging fruit: implementing preloading takes just a few lines of code to work. Similarly, DNS-prefetching external connections can also help speed up the loading process. By loading required assets (like fonts) as soon as possible, the visitor experiences the loading process as much faster. Preloading key request refers to setting the priority of files that need to be downloaded by the browser. Kraken.io is also a great online tool where you can upload your image and get it in a much smaller filesize. You can use image editing tools to reduce the quality and size or use online image management tools like Imgix to handle this. Yet by doing so, the size of that image can be close to only 15% of the original. Normally reducing the image of a JPEG image to about 75% of the original quality is almost invisible. It means you can reduce the quality of images and by doing so, reducing the file size. More about responsive images Optimize images / Efficiently encode images This is solved by using responsive images, which lets you select the right image for every screen size. One challenge here is the variation in screen sizes: a full-size header image on desktop will be much larger than on mobile. In the above example, you would reduce it to 300 x 200 pixels, save about 90% bandwidth, without losing any image quality. Change the dimensions of your image to the size it is shown on the page. To avoid this, always try to make the original image about the size of the space it gets on your website. And because images are often using up a lot of bytes, this can seriously hurt your page performance. It makes no sense to download a 3000 by 2000 pixels image if you only show it as a thumbnail on the page. Setting up browser caching settings needs to be done in the server settings and is quite easy. ![]() Good candidates for browser caching are images, javascript, CSS, and font files. ![]() You can normally set the so-called Time to Live (TTL) to 30 days, meaning browsers will save those assets up to 30 days before checking if there's a newer file available. This means fewer files need to be downloaded for subsequent page views, making the experience a lot faster. Leverage browser cachingīrowser caching means assets like images, javascript files, and stylesheets are saved in the visitor's browser cache. This needs to be done by a developer with access to server settings, but it's just a few lines of code. Normally it's relatively easy to enable either Gzip or Brotli compression. Text compression is like a zip-file for your website: it reduced the size of HTML, CSS and Javascript by up to 90%. Keep in mind that these are general estimates based on our experience, and they may vary from website to website. ![]() We've added the estimated impact (how much positive impact does this change have on your page speed) and effort (how long does it take to fix this). As an SEO, you can use this to create bite-sized pieces of work for developers. This article gives you actionable tips to help you improve page speed. But unless you have a technical background, it’s not always easy to know how to make these work. When using Pagespeed Insights, Google gives you very useful suggestions.
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