How to Improve Core Web Vitals in Next.js (2026 Guide)
Learn how to improve Core Web Vitals in Next.js with practical strategies to fix LCP, CLS, and INP, boost SEO rankings, and increase website conversions in 2026.
Website speed is no longer optional. In 2026, Core Web Vitals directly impact your search rankings, conversion rate, and user trust.
If your Next.js website feels slow, unstable, or laggy — you’re losing traffic and revenue.
In this guide, we’ll break down:
- What Core Web Vitals are
- How they affect SEO
- How to fix LCP, CLS, and INP in Next.js
- Advanced optimization techniques used in production SaaS apps
Google measures 3 primary performance metrics:
How fast the main content loads.
Target: Under 2.5 seconds
How stable your layout is during loading.
Target: Under 0.1
How responsive your site is.
Target: Under 200ms
Google uses these metrics as ranking signals.
But even more important:
- Faster sites convert better
- Users trust fast brands
- Slow sites increase bounce rate
A 1-second delay can reduce conversions by up to 7%.
How to Fix LCP in Next.js
LCP issues usually come from:
- Large hero images
- Slow API calls
- Blocking scripts
- Poor server response time
Instead of:<img src="/hero.jpg"/>
Use:
import Image from 'next/image'
<Image src="/hero.jpg" width={1200} height={600} priority/>
In layout.tsx:
<link
rel="preload"
href="/fonts/inter.woff2"
as="font"
type="font/woff2"
crossOrigin="anonymous"
/>
If possible:export const runtime = 'edge'
Edge rendering reduces TTFB globally.
How to Fix CLS in Next.js
Layout shift happens when:
- Images don’t have dimensions
- Fonts load late
- Dynamic content pushes layout
Next.js Image handles this automatically.
Example:
<div style={{ minHeight: 300 }}>
{data && <Component />}
</div>
display: 'swap'
Prevents invisible text flash.
How to Fix INP (Interaction Performance)
INP is the new FID.
Common causes:
- Heavy client-side JS
- Too many third-party scripts
- Unnecessary re-renders
Next.js 15 makes this powerful.
Move logic server-side where possible.
const Chart = dynamic(() => import('./Chart'), {
ssr: false,
})
Audit your bundle:next build
Look at bundle size report.
Advanced Performance Techniques
Reduce unnecessary client rendering.
loading="lazy"
Avoid N+1 queries.
Set proper headers.
How to Measure Improvements
Use:
- PageSpeed Insights
- Lighthouse
- Chrome DevTools
- Vercel Analytics
When to Get Professional Help
If your site:
- Scores below 70
- Loads slower than 3 seconds
- Has poor mobile score
- Feels unstable
You’re leaving money on the table.
🚀 Get a Free Website Performance Audit
We’ll analyze:
- Core Web Vitals
- Hosting performance
- Code inefficiencies
- SEO technical issues
👉 Request Your Free Audit:
https://beveez.tech/get-free-audit
Bhupinder Singh
Bhupinder Singh is a veteran web developer with 20+ years of experience designing and building websites, platforms, and SaaS products. His expertise includes WordPress development, custom plugin engineering, Advanced Custom Fields, and modern frontend frameworks like React and Next.js. He writes about web development, technology, and building scalable digital solutions.
Want to Improve Your Website Performance?
Get a free website performance audit and actionable recommendations.
Get Free Audit
