Core Web Vitals

Christian Schreiber

Web Performance Consultant


What are Core Web Vitals?

Core Web Vitals are a group of specific factors defined by Google to evaluate the user experience (UX) of a website. These metrics are crucial for assessing the performance of a page in terms of loading time, interactivity and visual stability. In May 2020, Google announced that these metrics will become an integral part of the search algorithm, which means that they can have a direct impact on the ranking of websites.

Which metrics belong to the Core Web Vitals?

The Core Web Vitals include three main metrics:

Largest Contentful Paint (LCP): This metric measures the time it takes for the largest visible content element on a page to load. An LCP value of 2.5 seconds or less is ideal.

First Input Delay (FID): FID measures the time it takes for a page to respond to the first user interaction, such as clicking on a link. A good FID value is less than 100 milliseconds.

Cumulative Layout Shift (CLS): This metric evaluates the visual stability of a page by measuring unpredictable layout shifts. An optimum CLS value is below 0.1.

Why are Core Web Vitals important?

Core Web Vitals are not just technical metrics, but have a direct impact on the user experience. A page that loads quickly and responds quickly to input offers a better experience and has a higher chance of being rated positively and recommended by users. This in turn can increase the time spent on the page and reduce the bounce rate.

How do Core Web Vitals influence the SEO ranking?

Core Web Vitals have been an integral part of the Google ranking algorithm since June 2021. Pages that do not meet these metrics could be ranked lower in the search results. Google wants to give its users the best possible experience, and a smooth, fast website is a key part of that.

How can Core Web Vitals be optimized?

The optimization of Core Web Vitals requires a thorough analysis of the website and the implementation of specific measures. Here are some of the key strategies for improving each metric:

How do you improve the Largest Contentful Paint (LCP)?

Server optimizations: Reduce server response times by using fast hosting solutions and optimized server configurations.

Resource prioritization: Load critical resources such as main images and texts first to ensure that they are visible quickly.

Reduction of CSS and JavaScript: Minimize and asynchronize CSS and JavaScript files to reduce rendering time.

How do you improve the First Input Delay (FID)?

Reduce JavaScript execution: Minimize the time required to execute JavaScript to reduce page response time.

Optimization of third-party codes: Analyze and optimize the integration of third-party scripts, which can often cause long loading times.

Using Web-Worker: Use Web-Worker to decouple background tasks from the main thread processing and thus ensure a faster response time.

How do you improve the Cumulative Layout Shift (CLS)?

Avoid dimensions for media: Make sure that all images and videos are loaded with fixed dimensions to avoid layout shifts.

Avoid dynamic content insertion: Avoid dynamically adding content on top of existing content, which can lead to sudden layout changes.

Use stable layout patterns: Use layout methods that guarantee a stable design, regardless of when and how content is loaded.

What are the challenges in optimizing Core Web Vitals?

Optimizing core web vitals can be complex and challenging, especially for large or high-traffic websites. Frequent obstacles are:

Outdated technologies: Older websites often use technologies and plugins that are not optimized for modern web performance standards.

Third-party scripts: Many sites use extensive third-party services that cannot be easily optimized or removed without affecting functionality.

User expectations: Users increasingly expect fast and responsive websites, which increases the pressure to make constant improvements.

How can these challenges be overcome?

Continuous monitoring: Rely on ongoing monitoring tools to continuously evaluate the performance of your website and identify potential for improvement.

Modern technologies: Update outdated technologies and plugins to current versions that are better optimized for performance and stability.

Team collaboration: Work closely with developers, designers and other stakeholders to find holistic solutions that improve both user experience and website performance.

What is the verdict on Core Web Vitals?

Core Web Vitals are crucial for evaluating and improving the user experience on your website. By optimizing performance in the areas of load time, interactivity and visual stability, you not only improve user satisfaction, but also your chances of ranking higher in Google search results. However, optimizing these metrics requires continuous efforts and adjustments in order to meet the constantly evolving requirements.

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Professional optimization of website load time, Google PageSpeed Score and Web Vitals