Core Web Vitals: what they are and why they matter for Indian websites

Core Web Vitals became an official Google ranking factor in mid-2021. By early 2023, a surprising number of Indian websites are still failing these metrics. I check scores for new clients routinely and the pattern is consistent: slow LCP, high CLS on mobile, poor INP. Understanding what these metrics mean and why they matter for Indian users specifically can help you prioritise the right fixes.

The three Core Web Vitals and what they measure

LCP stands for Largest Contentful Paint. It measures how long it takes for the main content of a page to load. For most websites, this is the hero image or the main headline. Google considers anything under 2.5 seconds good. Above 4 seconds is poor. Indian websites hosted on shared servers in India often score 4 to 7 seconds, which is a real problem.

CLS stands for Cumulative Layout Shift. This measures how much the page layout jumps around as it loads. You have experienced this: you are about to click a button, an ad loads above it, everything shifts down, and you tap the wrong thing. Google considers a CLS score under 0.1 good. Websites that load ads, pop-ups, or dynamic content without reserving space for those elements typically score poorly here.

INP stands for Interaction to Next Paint. This replaced FID (First Input Delay) as a Core Web Vital in March 2024, but Google introduced it as a pending metric earlier. It measures how quickly a page responds to user interactions like clicks or taps. For Indian users often on mid-range Android phones, this matters significantly.

Why Indian websites score worse than global averages

Indian users disproportionately access websites on mobile networks, often 4G in metro cities and 3G or lower in tier-2 and tier-3 areas. A website that loads acceptably on a fast connection with a high-end device can fail Core Web Vitals on a ₹10,000 Android phone on a busy network.

Many Indian websites also rely on shared hosting from providers like GoDaddy India or Bluehost India, where server response times (TTFB) are high. A slow server makes LCP worse regardless of how well-optimised your frontend is.

Unoptimised images are the single largest contributor to poor LCP on Indian websites. A homepage hero image of 2 or 3 megabytes is common. On a slow connection, this alone can push LCP to 6 or 7 seconds.

How Core Web Vitals affect your rankings

Google uses field data (real user experiences from Chrome users) to assess Core Web Vitals, not just lab data from tools like Lighthouse. This means your scores reflect how actual Indian users experience your website, not how it performs in a test environment.

Sites that score "good" on all three metrics get a small ranking boost. Sites that score "poor" do not get penalised heavily on their own, but in competitive niches where your competitors are scoring well, your poor scores become a disadvantage.

How to check your scores

Google Search Console has a Core Web Vitals report that shows your URL performance based on real user data. PageSpeed Insights (pagespeed.web.dev) shows both lab and field data for individual URLs. GTmetrix and WebPageTest are useful for diagnosing specific problems.

Start with PageSpeed Insights on your homepage and your most important landing pages. Focus on the mobile tab, not desktop, since most Indian users are on mobile. The tool gives specific recommendations ranked by impact.

Frequently asked questions