What Are Core Web Vitals?
Core Web Vitals are a set of specific metrics that Google uses to measure the quality of a user's experience on your website. They focus on three key aspects: loading performance, interactivity, and visual stability.
Google officially incorporated Core Web Vitals into its ranking algorithm, meaning that websites with poor scores may rank lower than competitors with better scores — even when content quality is similar.
The Three Core Web Vitals Metrics
1. Largest Contentful Paint (LCP) — Loading Performance
LCP measures how long it takes for the main content of a page to fully load and be visible to the user. This is typically the largest image, video, or block of text visible in the viewport.
- Good: Under 2.5 seconds
- Needs Improvement: 2.5 – 4 seconds
- Poor: Over 4 seconds
If your hero image or main content takes 5 seconds to load on mobile, you're providing a poor experience and will be ranked accordingly.
2. Interaction to Next Paint (INP) — Interactivity
INP measures how quickly your website responds when a user interacts with it — clicking a button, filling in a form, or tapping a link. A slow response time creates a frustrating experience.
- Good: Under 200 milliseconds
- Needs Improvement: 200 – 500 milliseconds
- Poor: Over 500 milliseconds
3. Cumulative Layout Shift (CLS) — Visual Stability
CLS measures how much your page's visual content unexpectedly moves around while loading. Have you ever tried to click a button on a mobile website, only for it to jump down the page just as you tapped? That's a CLS issue.
- Good: Under 0.1
- Needs Improvement: 0.1 – 0.25
- Poor: Over 0.25
Why Core Web Vitals Matter for Your Business
Beyond ranking implications, poor Core Web Vitals directly cost you business. A 1-second delay in page load time can reduce conversions by 7%. A website that loads in 5 seconds has a bounce rate 90% higher than one that loads in 1 second. Users who have a frustrating experience are unlikely to enquire — or return.
How to Measure Your Core Web Vitals
Google PageSpeed Insights
The simplest way: go to pagespeed.web.dev and enter your URL. You'll get scores for both mobile and desktop, along with specific issues to fix. Pay particular attention to your mobile score — most Australians search on mobile.
Google Search Console
The "Core Web Vitals" report in Search Console shows you how your pages are performing across real user data, flagging pages with poor scores that need attention.
Chrome DevTools
For technical teams, Chrome DevTools provides detailed performance data for individual page loads.
How to Improve Your Core Web Vitals
Improving LCP (Loading Speed)
- Compress and properly size all images — this is usually the biggest win
- Use modern image formats (WebP instead of PNG or JPEG where possible)
- Implement lazy loading for below-the-fold images
- Use a content delivery network (CDN) to serve content from servers close to your users
- Upgrade to faster hosting — cheap shared hosting is often a major culprit for slow LCP
- Remove unnecessary plugins, scripts, and third-party code
Improving INP (Interactivity)
- Minimise and defer JavaScript that runs during page load
- Remove or replace heavy third-party scripts (chat widgets, analytics, social embeds)
- Optimise event handlers so they execute efficiently
Improving CLS (Visual Stability)
- Always specify width and height dimensions for images and videos
- Avoid inserting content above existing content (ads, banners, cookie notices)
- Use CSS transforms for animations rather than layout-affecting properties
- Reserve space for ads and embeds so they don't push content around on load
The Most Common Core Web Vitals Issues for Australian Business Websites
Based on typical local business websites, the most common issues are: uncompressed images (massive files that take seconds to load); slow shared hosting; excessive third-party scripts; missing image dimensions causing CLS; WordPress plugin bloat creating interactivity delays.
Fixing these common issues alone can dramatically improve your scores and rankings.
Setting Expectations
Achieving "Good" scores across all three Core Web Vitals requires technical work. For most business owners, this is best handled by a web developer or SEO professional with technical expertise. The investment is worthwhile — the ranking and conversion improvements typically far exceed the cost of the improvements.
