Core Web Vitals Explained: Why Website Speed Affects Rankings and Sales
What LCP, INP and CLS mean, the scores Google looks for, and the fixes that make the biggest difference on most business websites.
A slow website loses visitors before they read a word, especially on mobile data. Google measures real-world user experience with Core Web Vitals and uses them as part of its page experience signals. Here is what they mean and how to improve them.
The three Core Web Vitals
Largest Contentful Paint (LCP)
How long the main content (often the hero image or headline) takes to appear. Good: 2.5 seconds or less.
Interaction to Next Paint (INP)
How quickly the page responds when someone taps or clicks. INP replaced First Input Delay in 2024. Good: 200 milliseconds or less.
Cumulative Layout Shift (CLS)
How much the page jumps around while loading, for example when an image pushes text down. Good: 0.1 or less.
How to check your scores
- PageSpeed Insights (pagespeed.web.dev) shows field data from real Chrome users and lab tests.
- Google Search Console has a Core Web Vitals report for your whole site.
Fixes that help most websites
- Compress and resize images and serve modern formats like WebP or AVIF.
- Set width and height on images and embeds to prevent layout shift.
- Remove unused plugins and scripts, especially sliders, chat widgets and trackers you don't use.
- Load fonts efficiently: self-host them and use font-display swap.
- Defer non-essential JavaScript so it doesn't block the first view.
- Use caching and compression (Gzip or Brotli) and a good host.
- Lazy-load images below the fold, but not the main hero image.
- Keep pages lean: fewer third-party embeds, simpler sliders, lighter videos.
Why it matters for business, not just SEO
Faster pages keep visitors longer and convert better. Mobile users in India often browse on variable connections, so a site that feels instant has a real advantage.
Our websites target 90+ PageSpeed scores from day one. If your current site is slow, our website maintenance and WordPress speed optimisation services can help.