Core Web Vitals (CWV) is a set of metrics that measure the real-world user experience of loading, interactivity, and visual stability of web pages. They are used by Google to rank websites in search results, and are increasingly important for website owners who want to provide a good user experience.
Three pillars of Core Web Vitals are:
- Largest Contentful Paint (LCP) measures how long it takes for the largest content element to appear on the page. This is important because it affects how quickly users can see and interact with the content on the page.
- First Input Delay (FID) measures how long it takes for a page to become interactive after the user has taken an action, such as clicking a button. This is important because it affects how quickly users can interact with the page and get what they want.
- Cumulative Layout Shift (CLS) measures how much the content on a page shifts around as it loads. This is important because it can be jarring and distracting for users.
In 2023, Google announced that Interaction to Next Paint (INP) will replace FID as the Core Web Vital for Interactivity. INP measures the time it takes for a page to become interactive after the user has taken an action, but it also takes into account the time it takes for the next significant paint to occur. This means that INP is a more accurate measure of how quickly users can interact with a page.
Core Web Vitals are measured on a scale of 0 to 100, with 100 being the best score. The goal for all websites is to achieve a score of 75 or higher for all three metrics.
There are a number of things that website owners can do to improve their Core Web Vitals scores. These include:
- Using a CDN. A CDN (content delivery network) can help to deliver web pages more quickly by caching static assets closer to users.
- Embedding images instead of linking to them. This will prevent the browser from having to download the image twice, which can improve loading times.
- Using lazy loading. Lazy loading delays the loading of images and other resources until they are actually needed by the user. This can improve loading times for pages with a lot of images.
- Optimizing your website’s code. This includes removing unnecessary code, minifying code, and using caching.
Improving your Core Web Vitals scores can have a number of benefits, including:
- Improved user experience. Faster loading pages and more responsive pages will make your website more user-friendly.
- Increased search engine rankings. Google uses Core Web Vitals as a ranking factor, so improving your scores can help your website rank higher in search results.
- Increased conversions. Faster loading pages and more responsive pages can lead to more conversions, such as sales or sign-ups.
Google considers these Core Web Vitals as crucial factors for ranking websites in search results, particularly for mobile searches. Websites with better user experience, as indicated by good Core Web Vitals scores, are likely to rank higher in search results, gaining more visibility and potentially attracting more visitors.
Website owners and developers should prioritize optimizing their sites to achieve good Core Web Vitals scores to ensure a smooth and enjoyable experience for their users and improve their website’s overall performance. Google provides tools like PageSpeed Insights and Search Console to help website owners monitor and improve their Core Web Vitals scores.