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How to Use Preloading to Improve Core Web Vitals
Website performance is essential when it come to user experience (UX), conversions, and search engine optimisation (SEO). One of the factors influencing website performance is how fast the browser can load the resources that your web page needs, such as fonts, scripts, images, and style sheets.
Understanding Preloading
Preloading is a tactic allowing you to specify in the HTML document which resources should be loaded as soon as possible. Preloading can be used for all types of attributes indicating the type of resource, helps the browser apply the correct priority. It is useful for resources that are not dissevered by the browser until later, such as images, fonts, and scripts that may be applied using JavaScript or CSS.
Preloading improves web performance by reducing latency and the number of trips between the browser and server. When you preload resources that are important for functionality and rendering, you ensure they are available when the browser needs them, without waiting for the document and other resources to finish loading. This speeds up loading time, boosting engagement, and user experience.
Preloading is a strategy to improve core web vitals, but it is not a one-size-fits-all approach. It needs to be used strategically, as it can have a negative impact on your performance, such as delaying the load event. In order to use it effectively, only preload essential resources that are not easily discoverable by the browser, along with resources requested by JavaScript or CSS.
Prioritise above the fold content, along with high priority and long latency resources.
Preloading can be very beneficial, helping to improve your core web vitals, but measuring it is just as important, ensuring it is working as expected. There are a variety of tools and methods you can use.
The network panel in a browser’s developer tools will show timing and priority of each resource request, enabling you to filter them by type. While the Performance panel will display loading and rendering performance, along with a flame chart for each resource.
Lighthouse is valuable to provide a score and report on your web page, ensuring it follows best practices for web performance, along with recommendations to fix any issues.
Preloading is such a powerful technique, though often overlooked. It is not easy to implement. When it comes to preloading the correct resources, you need to consider the compatibility and support of different browsers and platforms.
Preloading essential website elements is an excellent way to improve your core web vitals. Preloading certain elements ensures your page is perceived as loading quicker, boosting user experience and SEO efforts. Do you need assistance improving the core web vitals on your website? Get in touch with Genie Crawl today to find out more.
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