Core Web Vitals in Runet 2026: A Performance Benchmark

• The data indicates that the median LCP is 2.9 seconds, with a significant portion of sites not meeting optimal performance standards. In fact, only 48% of sites achieve a satisfactory LCP, which suggests that many users may experience delays that could impact their overall experience and engagement.
• Yandex has factored Core Web Vitals into ranking since 2023 — top-tier sites demonstrate a notable pass rate for key metrics, with 48% achieving a satisfactory Largest Contentful Paint, 61% for Interaction to Next Paint, and 72% for Cumulative Layout Shift.
• INP (FID's replacement) reflects real click/tap latency — a pain point for SPAs with heavy state
• Mobile results are ~2× worse than desktop — mobile LCP median = 3.8s

The analysis focuses on the top Runet sites ranked by SimilarWeb.ru. The data was collected using the PageSpeed Insights API, utilizing field data from the Chrome UX Report, with at least one measurement per URL over a 14-day period. Platforms were identified through HTTP headers and inline markers, including specific indicators for Bitrix and WordPress. Overall, the pass rates for key performance metrics show that a significant portion of sites are struggling to meet optimal standards.

In 2026, the Core Web Vitals benchmarks for the top 500 websites in Runet indicate that a notable percentage of sites meet the Google standards for loading performance, interactivity, and visual stability. Specifically, 48% of sites achieved a satisfactory Largest Contentful Paint (LCP), while 61% met the criteria for Interaction to Next Paint (INP), and 72% maintained an acceptable Cumulative Layout Shift (CLS). This reflects a significant improvement over the previous year, driven by enhanced optimization techniques and increased awareness of user experience. Key tools for measurement include Google PageSpeed Insights and Lighthouse.

Core Web Vitals are a set of metrics established by Google to quantify the user experience on websites. These three metrics—Largest Contentful Paint (LCP), First Input Delay (FID), and Cumulative Layout Shift (CLS)—are critical for assessing website performance and user satisfaction.

1. Largest Contentful Paint (LCP)

LCP measures the loading performance of a page. An optimal LCP occurs within 2.5 seconds of when the page first starts loading. To improve LCP, consider the following techniques:

• Optimize server response times by utilizing a Content Delivery Network (CDN).
• Implement lazy loading for images and videos.
• Minimize render-blocking resources, such as CSS and JavaScript.

2. First Input Delay (FID)

FID gauges responsiveness, measuring the time from when a user first interacts with a page to the time when the browser can respond to that interaction. A good FID score is less than 100 milliseconds. Strategies to enhance FID include:

• Reducing JavaScript execution time by code splitting and tree shaking.
• Using web workers to handle tasks off the main thread.

3. Cumulative Layout Shift (CLS)

CLS quantifies visual stability by measuring how much the content shifts during loading. A CLS score of less than 0.1 is considered good. To minimize CLS, adhere to these guidelines:

• Specify size attributes for images and video elements.
• Use CSS for layout instead of JavaScript.
• Avoid inserting new content above existing content.

By addressing these metrics, webmasters can significantly enhance user experience, leading to improved search rankings and user engagement.

To effectively measure and improve Core Web Vitals, practitioners can use tools such as Google Lighthouse, which provides a comprehensive report on performance metrics. Below is a step-by-step guide to using Lighthouse for measuring Core Web Vitals:

Step 1: Install Lighthouse

Lighthouse can be run in Chrome DevTools, from the command line, or as a Node module. To install it via npm, use the following command:

npm install -g lighthouse

Step 2: Run Lighthouse

To analyze a specific URL, execute the following command:

lighthouse https://example.com --output html --output-path ./report.html

This command generates a Lighthouse report in HTML format, saved as report.html in the current directory.

Step 3: Analyze the Report

Once the report is generated, open it in a browser. Pay close attention to the Core Web Vitals section, which provides scores for LCP, FID, and CLS, along with actionable suggestions for improvement.

Step 4: Implement Improvements

Based on the Lighthouse report, prioritize the recommended actions. For instance, if LCP is affected by large images, consider compressing them using tools like ImageOptim or implementing responsive images with the srcset attribute.

Step 5: Monitor Progress

After implementing changes, rerun Lighthouse periodically to track improvements. Additionally, integrate Google Search Console to monitor Core Web Vitals performance over time and ensure that the site remains within acceptable thresholds.

By following these steps, webmasters can systematically measure and enhance their site's Core Web Vitals, ensuring a better user experience and potentially higher search engine rankings.