Does Your Website Pass Core Web Vitals? Fewer Than Half of Mobile Sites Do

Published 24 September 2026

Does your website pass Google's Core Web Vitals on mobile? The HTTP Archive's Web Almanac, which analyzes real-world data from across the web, found that 48% of mobile sites did in 2025, up from 44% the year before. Its main analysis uses July 2025 measurements.

Core Web Vitals are three measures of how a page feels to a visitor. Google's web.dev guide sets the targets. Largest Contentful Paint (LCP), which measures loading, should occur within 2.5 seconds of when the page first starts loading. Interaction to Next Paint (INP), which measures responsiveness, should be 200 milliseconds or less. Cumulative Layout Shift (CLS), which measures visual stability, should be 0.1 or less. Google suggests judging each one at the 75th percentile of page loads, with mobile and desktop measured separately.

The Almanac shows where mobile sites struggle most. 62% had good LCP, compared with 77% for INP and 81% for CLS. In other words, loading speed is where most mobile sites lose points.

This matters because a page that loads slowly or jumps around as it loads is hard to use on a phone. Because loading is the weakest area, it is also the place where many sites have the most room to improve.

At Zamorins Solutions we design, build and maintain websites for business.

What you can do this week

• Run your home page and your most visited page through PageSpeed Insights and note the mobile LCP, INP and CLS results.
• Look at the largest image or text block at the top of each page, and make sure it is compressed and not held up by heavy scripts.
• Write the results down and test again in a month to see whether changes helped.

Takeaway: Fewer than half of mobile sites pass all three Core Web Vitals, so test your own mobile pages and start with loading speed.

Sources

• Web Almanac 2025: Performance, HTTP Archive (January 15, 2026)
• Web Vitals, Google, web.dev