Technical SEO Essentials: Core Web Vitals and Site Performance

Technical SEO Essentials: Core Web Vitals and Site Performance

Core Web Vitals are a set of metrics that Google uses to measure user experience. They're a confirmed ranking factor, and in 2026, they're more important than ever.

What Are Core Web Vitals?

Core Web Vitals measure three aspects of user experience:

1. LCP (Largest Contentful Paint): How quickly the main content loads
2. INP (Interaction to Next Paint): How responsive your site is to user input
3. CLS (Cumulative Layout Shift): How stable your layout is as it loads

The 2026 Thresholds

To pass Core Web Vitals, your site must meet these targets:

• LCP: ≤ 2.5 seconds
• INP: ≤ 200 milliseconds
• CLS: ≤ 0.1

How to Measure Core Web Vitals

1. Google PageSpeed Insights

Visit pagespeed.web.dev and enter your URL. This is the official Google tool.

2. Google Search Console

In Search Console, go to "Experience" > "Core Web Vitals" to see field data.

3. Chrome DevTools

Open Chrome DevTools (F12), go to the "Lighthouse" tab, and run a report.

How to Fix Common Issues

Fixing LCP: Optimise hero images, minimise render-blocking JavaScript, use a CDN, preload critical resources.

Fixing INP: Break up long JavaScript tasks, defer non-critical JavaScript, optimise event listeners.

Fixing CLS: Reserve space for images and ads, avoid inserting content above existing content, use transform animations.

Why It Matters

Sites with good Core Web Vitals rank higher and convert better. Audit your Core Web Vitals today. Need help? Explore our technical SEO services.