TL;DR. Largest Contentful Paint (LCP), Interaction to Next Paint (INP), and Cumulative Layout Shift (CLS) are the three Core Web Vitals. Fix images, defer JS, reserve image space — and you pass.
Core Web Vitals are not the biggest ranking factor — but failing them caps your ceiling. This guide walks through each metric in detail with the specific techniques our engineering team uses to get sites passing.
Key takeaways
- LCP: Largest Contentful Paint under 2.5s
- INP: Interaction to Next Paint under 200ms
- CLS: Cumulative Layout Shift under 0.1
- Measuring CWV in 2026
- WordPress-specific CWV optimisations
LCP: Largest Contentful Paint under 2.5s
The biggest LCP wins: serve hero images via modern formats (AVIF, WebP), preload the LCP image, eliminate render-blocking CSS, host fonts locally, use a CDN. Most sites can go from 4s+ LCP to under 2.5s in 2-3 days of focused work.
INP: Interaction to Next Paint under 200ms
INP replaced FID in 2024 and is the strictest CWV. Wins: split JavaScript bundles, defer non-critical scripts, debounce expensive event handlers, virtualise long lists, use web workers for heavy computation.
CLS: Cumulative Layout Shift under 0.1
CLS is mostly an image and font problem. Wins: always set width + height on images (or use aspect-ratio CSS), preload fonts with font-display: swap and fallback metrics, never inject content above the fold dynamically.
Measuring CWV in 2026
Use real-user monitoring (RUM), not synthetic tests. Google Search Console’s CWV report is the official source. PageSpeed Insights gives field data (CrUX) plus lab data. Lighthouse for development testing only.
WordPress-specific CWV optimisations
Use a fast cache plugin (LiteSpeed Cache if you host on LiteSpeed servers, otherwise WP Rocket). Optimise images automatically (ShortPixel, Smush). Defer JS automatically. Use a lean theme. Avoid plugin bloat — each plugin is a potential CWV cost.
Real-world example
A typical client in this category sees 3-5x organic traffic growth within 6-9 months on our Growth-tier plan, with AI search citations climbing from zero to 8-12 per month over the same period.
Authoritative sources we relied on
- Google Search Essentials — Primary source for ranking documentation
- Moz Learn SEO — Beginner-to-advanced SEO reference
- Ahrefs Blog — Data-backed SEO research
- SEMrush Blog — Industry trends and benchmarks
- Search Engine Land — Daily SEO industry news
Frequently asked questions
Who is SEOIndia?
A senior, AI-first SEO agency headquartered in Noida (Delhi NCR), India. We serve 30+ countries with 8 currency options.
How quickly will I see results?
Most clients see ranking movement in 30 days, meaningful traffic in 90 days, compounding revenue impact in 6 months.
What is the minimum contract?
Monthly billing, 7 days notice to cancel, 30-day money-back guarantee.
Do you optimise for ChatGPT and Perplexity?
Yes. AI search optimisation (GEO + AEO) is included on every Growth-tier plan and above.
What currencies do you accept?
USD, INR, EUR, GBP, AUD, CAD, AED, SGD — 8 currencies with live conversion at checkout.
What payment methods are accepted?
Stripe, Razorpay, PayPal, and wire transfer for enterprise deals.
How do I cancel?
Email us with 7 days notice. No claw-backs on work delivered.
Will I work with a junior or a senior?
Senior. Every account is led by a strategist with 8+ years of experience, named on your account.
Do you build PBNs or buy links?
Never. Only editorial mentions from real publications. PBNs destroy sites in 2026.
Can I see real case studies?
Yes — see our case studies page for specific client outcomes.
Do you offer paid ads?
Yes, Google Ads, LinkedIn Ads, Meta Ads as add-ons.
How is reporting done?
Live dashboards plus monthly strategy reports. No “trust us” PDFs.
What if my industry is niche?
Most industries are well-served. We have shipped strategies for SaaS, healthcare, real estate, fintech, education, eCommerce, B2B services, and more.
Do you handle international SEO?
Yes — hreflang, ccTLD strategy, multi-language content. We routinely run multi-country campaigns.
Is there a setup fee?
No setup fees. Month one is your first audit + roadmap, included in the first invoice.
How do you handle technical SEO fixes?
We coordinate with your developer or your CMS, or we do it ourselves on WordPress/Webflow/Shopify.
Will my account have a slack channel?
Yes, all Growth+ tier clients get a shared Slack or Teams channel with the strategist.
Do you sign NDAs?
Yes, standard. We will sign whatever NDA you provide.
Is my data secure?
GDPR + DPDPA compliant. We store the minimum data needed and you can request deletion any time.
How do I get started?
Run our free SEO audit first. It is free, fast, and gives you a 90-day roadmap — no commitment needed.
Next steps
Ready to apply this in your own business? Run our free 100-point AI audit and a senior strategist will email you a custom 90-day roadmap within 72 hours. No credit card, no commitment.