Key Takeaway: Core Web Vitals measure how fast your main content appears (LCP), how quickly the page responds to taps and clicks (INP) and how stable the layout is (CLS). Most problems come from heavy images, too much JavaScript, slow hosting and elements that load without reserved space, and all of them can be fixed.
What are Core Web Vitals? They are three measurements Google uses to judge the real-world experience of a web page: how quickly the main content loads, how quickly the page reacts when someone interacts with it, and whether the layout jumps around while loading. They are part of Google’s page experience signals, but more importantly they reflect whether visitors stay or leave.
The three Core Web Vitals, in plain English
| Metric | What it measures | “Good” threshold |
|---|---|---|
| LCP – Largest Contentful Paint | How long until the biggest visible element (usually a hero image or headline) appears | 2.5 seconds or less |
| INP – Interaction to Next Paint | How quickly the page visually responds after a tap, click or key press | 200 milliseconds or less |
| CLS – Cumulative Layout Shift | How much content unexpectedly moves while the page loads | 0.1 or less |
Google assesses these at the 75th percentile of real visits, so a page needs to be fast for most of your visitors, not just on a fast office connection. INP replaced the older First Input Delay (FID) metric in March 2024.
How to check your own website
- PageSpeed Insights: enter a URL to see real-user data (if Google has enough) plus a lab test with suggestions.
- Google Search Console: the Core Web Vitals report groups your URLs into Good, Needs improvement and Poor.
- Chrome DevTools: the Performance and Lighthouse panels show exactly which files and scripts are slowing a page down.
Always test on mobile. Most business websites get the majority of their traffic from phones, and that is where performance problems show up first.
What usually causes a slow LCP
- Oversized images: a 3–4 MB photo straight from a camera or stock site, used as the hero image.
- Old image formats: JPEG and PNG where WebP or AVIF would be a fraction of the size.
- Lazy-loading the hero image: the most important image should load immediately, not wait.
- Render-blocking CSS and fonts: large stylesheets and several web-font files that must download before anything is drawn.
- Slow server response: cheap shared hosting, no caching and no CDN.
Fixes: resize and compress images to the size they are actually displayed at, serve WebP or AVIF, preload the hero image and mark it as high priority, minify CSS, limit font weights, enable server caching and compression, and use a CDN where your audience is spread out.
What usually causes a poor INP
INP problems are almost always about JavaScript. When the browser’s main thread is busy running scripts, it cannot respond to the visitor’s tap.
- Too many third-party scripts: chat widgets, multiple analytics tags, heatmaps and social embeds.
- Heavy page builders and plugins that load code on every page whether it is needed or not.
- Large JavaScript bundles that run long tasks during load.
Fixes: remove scripts you don’t use, load non-essential ones after the page is interactive, split large bundles, defer work that is not needed immediately, and keep event handlers light. Each tag added “just to try something” has a cost.
What usually causes layout shift (CLS)
- Images and videos without width and height, so the page reflows when they arrive.
- Banners, cookie notices or ads injected above existing content.
- Web fonts that swap in and change text size.
Fixes: always set image and video dimensions (or an aspect ratio), reserve space for banners and embeds, and use font loading settings that minimise reflow.
A practical speed checklist
- Compress and resize every image; use WebP/AVIF with correct dimensions.
- Preload the hero image; lazy-load only images below the fold.
- Minify and combine CSS and JavaScript; remove unused code.
- Audit third-party scripts and remove anything that isn’t earning its place.
- Enable caching, compression and HTTPS on the server; consider a CDN.
- Set dimensions for all media to prevent layout shift.
- Retest on mobile after every major change.
Why speed matters for leads, not just rankings
Core Web Vitals are one ranking signal among many; great content on a slower page can still rank. The bigger impact is commercial: visitors who wait for a page, or tap a button that doesn’t respond, often leave before they enquire. A fast site makes every rupee spent on SEO and ads work harder.
How Digitech Scouts builds for performance
At Digitech Scouts, performance is part of the build rather than an afterthought: optimised images, minimal JavaScript, reserved layout space and clean technical SEO are included from day one. Website engineering is led by co-founder Alankrit Dhawan, alongside founder Prashant Gairola’s SEO strategy. See Scout Foundation or ask us to review your website’s speed. You may also find our guide on why websites lose customers useful.
Frequently Asked Questions
Are Core Web Vitals a Google ranking factor?
Yes. They are part of Google’s page experience signals. They are not the most important factor, as relevant and helpful content matters more, but a poor experience can hold a page back and reduces conversions.
What is a good LCP score?
Google considers an LCP of 2.5 seconds or less as good, measured at the 75th percentile of real page loads.
What replaced First Input Delay (FID)?
Interaction to Next Paint (INP) replaced FID as a Core Web Vital in March 2024. INP measures responsiveness across all interactions on a page, not just the first one.
Will a faster hosting plan fix my Core Web Vitals?
It can help server response time, but most issues come from heavy images, excessive JavaScript and layout shifts. These need to be fixed in the website itself.
Can Digitech Scouts improve my website’s Core Web Vitals?
Yes. Digitech Scouts audits and fixes website performance, including images, scripts, layout stability and server setup. Engineering is led by co-founder Alankrit Dhawan.
Who wrote this article?
This article was written by Alankrit Dhawan, Co-Founder and Full-Stack Web Developer at Digitech Scouts. He has worked as a software engineer since 2021, building production web systems with Java, Spring Boot, Node.js, Angular and GraphQL.
Who is Alankrit Dhawan?
Alankrit Dhawan is the co-founder of Digitech Scouts, a B2B digital marketing and web engineering company in Ahmedgarh, Punjab, India. He leads the agency’s website development, engineering and automation work.
What is Digitech Scouts and who founded it?
Digitech Scouts is a B2B digital marketing and web engineering company based in Ahmedgarh, Punjab, India. It was founded in 2023 by Prashant Gairola, with Alankrit Dhawan as co-founder and Full-Stack Web Developer.
Alankrit Dhawan
Alankrit is the Co-Founder and Full-Stack Web Developer at Digitech Scouts. He has worked as a software engineer since 2021 and builds production web systems with Java, Spring Boot, Node.js, Angular and GraphQL.
Read Alankrit's Full Bio →