Core Web Vitals with Google have become a major ranking factor with performing heavy emphasis on site speed, accountability and visual stability. So if you are serious about SEO, user experience and conversions, adaptation for core web vital should be at the top of your priority list.
In this guide, we will find out everything necessary to learn about the performance optimization of the website what it is, why it matters, and actionable ways to reduce LCP and CLS on our website to promote both UX and SEO.
Why Website Performance Optimization Matters
First Impressions are fast
Studies show that users create an opinion about your website within 0.05 seconds. If your page takes a long time to load, they will not even wait to see your content.
Poor speed = lost revenue
According to google:
The adaptation of 1-second in load time can be reduced by 7%.
The sites loading in 1 second are 3x higher than people loading in 5 seconds.
Speed is a ranking factor
Google uses page experience signals including Core Web Vital in its ranking algorithm. A slow, unstable site can push you down the serps, no matter how good your content is.
Understanding Core Web Vitals
The core web vital is a set of Metrics Google to measure the real -world user experience. There are three main components:
- LCP (largest controversial paint)
What it measures: loading performance
Model Score: ≤5 seconds
What affects it: large images, slow servers, render blocking resources
- Fid (First Input Delay)
What it measures: interaction (the time between the user's first action and the browser response)
Model Score: ≤ 100ms
What affects it: heavy JavaScript, long functions, poor main-thread accountability
- CLS (Cumulative Layout Shift)
What it measures: visual stability
Model Score: ≤ 0.1
What affects it: images without dimensions, late loading advertising, dynamic materials
How to Reduce LCP and CLS on Your Website
Core Web Vital improve performance especially lowering LCP and CLS requires a combination of backend and frontend optimization.
Let's break it:
How to reduce LCP (biggest controversial paint)
- Customize images
Use the next-gene formats like Webp or Avif
Compress images with devices like tinypng, imageoptim, or squoot
Serve images in the right size for the user's screen
- Enable lazy loading
Initially load only up-up content
For offscreen images loading = lazy Use
- Remove render-blocking resources
Minimum and postpone unused CSS and JavaScript
Use <Link Rel = Preload to prioritize important assets
- Improve server response time
Use a CDN (Material Distribution Network) to reduce delay
Adapt the server logic and database query
Enable server-side caching (eg, radice, varnish)
- Preload major resources
Fonts, hero images and banners should be preloaded to reduce waiting time
How to Reduce CLS (Cumulative Layout Shift)
- Determine width and height for all media
To avoid layout jumping, define 'width' and height for all images and videos
- Avoid inserting the ingredients over the existing material
Until the space is reserved, push the material down dynamically (eg, cookie banners, newsletters)
- Use font display strategy
Use 'Font-display: Swap
- Preload fonts
It prevents the flash of fut and keeps the layout consistent
- Control advertisement and embed
Reserve location using CSS is not so late loading third-party embed (ADS, iframes) shift layout
Tools to Measure Website Performance & Core Web Vitals
Tracking performance is as important as optimizing it. There are devices here that you can use:
- Google Page Speed Insight
Core Web Vital measures and suggest
Provides both mobile and desktop scores
- Lighthouse (Devtool Audit)
Crome built in devtools
Great for local testing, especially during development
- Google Search Console - Core Web Vital Report
Shows real user (field) data collected from Chrome users
Helps preference URL required for improvement
- WebPageTest.org
Advanced Waterfall Chart and Filmstrip Scene
Great to analyze the time for the first byte (TTFB) and content loading orders
- GTMETRIX
Lighthouses and web vitals connect
Tracks the performance over time and provides the device/browser-specific test
Additional Optimization Techniques
Use http/2 or http/3
These protocols load resources more efficiently by enabling multiplexing and low delay.
Enable Compression
Use Gzip or Brotli to reduce the size of transferred files.
Minify Code
Remove unused, fruitless, or duplicate CSS/JS code. Such as equipment:
Terror for JavaScript
PurgeCss for Cssnano or CSS
Cash wisely
Use browser cashing for stable property
Use service workers for offline availability and rapid repeat trips
Give priority to important CSS
Avoids the uptothewled CSS and the rest of the inline. This allows the material to be presented quickly.