Category: SEO

Core Web Vitals: SEO Guide to Improve Google Rankings

A website can have great content, strong backlinks, and well-optimized keywords and still struggle to perform if the actual website experience is poor.

Think about what happens when you click a Google result and the page takes several seconds to become usable. You may leave before reading the first paragraph. If a button suddenly moves while you are trying to click it, you may simply close the page and look elsewhere.

This is where Core Web Vitals become important.

Core Web Vitals are Google's user-focused metrics for measuring loading performance, responsiveness, and visual stability. The three current metrics are Largest Contentful Paint (LCP), Interaction to Next Paint (INP), and Cumulative Layout Shift (CLS). Google recommends achieving good scores for these metrics as part of providing a strong page experience. Google also explains that Core Web Vitals are used by its ranking systems, but good scores alone do not guarantee higher rankings.

If you're working on SEO, technical SEO, website performance, or conversion optimization, improving Core Web Vitals should be part of your overall strategy.

What Are Core Web Vitals for SEO

What Are Core Web Vitals?

Core Web Vitals are a set of standardized metrics designed to measure important aspects of real-world user experience.

They focus on three areas:

LCP: How quickly the main content becomes visible.
INP: How quickly the page responds to user interactions.
CLS: How stable the page remains while loading.

The recommended "good" thresholds are:

Core Web Vital	What It Measures	Good Score
LCP	Loading performance	2.5 seconds or less
INP	Responsiveness	200 ms or less
CLS	Visual stability	0.1 or less

Google evaluates these metrics using real-world user data, and the recommended thresholds are assessed at the 75th percentile across mobile and desktop experiences.

This means you shouldn't optimize a page simply because it gets a perfect score in one test on your computer. Real users may have slower devices, weaker connections, or different browsing conditions.

Why Are Core Web Vitals Important for SEO?

One common misunderstanding is that improving Core Web Vitals automatically pushes a website to the top of Google.

That's not how it works.

Google's ranking systems consider many signals, and relevance and helpful content remain extremely important. Google itself says that achieving good Core Web Vitals does not guarantee top rankings. However, page experience can contribute to search success, particularly when several pages provide similarly relevant and useful information.

This makes Core Web Vitals important for SEO for several reasons.

Better User Experience

A fast and responsive website is easier to use.

Visitors can access content faster, interact with forms, browse products, and complete actions without unnecessary delays.

Lower Friction

Slow loading pages create friction throughout the customer journey.

For example, a visitor might click your Google result, wait for the page to load, and leave before seeing your offer.

That means the problem isn't necessarily your keyword targeting. The problem may be the website experience.

Better Conversion Opportunities

Website performance also affects conversion optimization.

A fast landing page can make it easier for visitors to:

Submit a lead form
Call your business
Purchase a product
Book an appointment
Request a quote
Navigate between pages

This is particularly important for businesses investing in paid advertising. If you're running campaigns, your landing page experience can directly influence the value you get from your traffic.

You can also read our guide on What Is a Good Conversion Rate in Google Ads? to understand how landing page experience can affect conversion performance.

The Three Core Web Vitals Explained

1. Largest Contentful Paint (LCP)

Largest Contentful Paint measures loading performance.

In simple terms, it measures how long it takes for the largest visible content element in the initial viewport to appear.

This could be:

A large heading
Hero image
Product image
Video poster
Large block of text

Google recommends an LCP of 2.5 seconds or less for a good experience.

Common Causes of Poor LCP

A high LCP score can happen because of:

Large unoptimized images
Slow server response times
Render-blocking CSS
Too much JavaScript
Poor hosting
Third-party scripts
Inefficient caching
Slow fonts

How to Improve LCP

Start by identifying the largest element on the page.

Then consider:

Compressing large images
Using modern image formats such as WebP or AVIF
Preloading important assets
Improving server response time
Removing unnecessary scripts
Reducing unused CSS
Using browser caching
Using a CDN where appropriate

For most websites, the hero image is one of the first places worth investigating.

Largest Contentful Paint LCP Optimization

2. Interaction to Next Paint (INP)

Interaction to Next Paint measures how responsive a webpage is when users interact with it.

INP replaced First Input Delay (FID) as a Core Web Vital in March 2024.

Examples of interactions include:

Clicking a menu
Selecting a product
Opening a popup
Submitting a form
Adding an item to a cart
Using filters
Clicking buttons

Google recommends an INP of 200 milliseconds or less for a good experience.

What Causes Poor INP?

JavaScript is often the main culprit.

Heavy JavaScript can keep the browser busy processing tasks instead of responding immediately to the visitor.

Common problems include:

Large JavaScript bundles
Long-running scripts
Excessive third-party tools
Poorly optimized event handlers
Heavy tracking scripts
Unnecessary animations
Complex page components

How to Improve INP

Developers can improve INP by:

Reducing JavaScript execution
Breaking long tasks into smaller tasks
Removing unnecessary third-party scripts
Deferring non-critical JavaScript
Optimizing event handlers
Reducing DOM complexity
Loading functionality only when required

You don't necessarily need to remove every script from your website.

The goal is to identify scripts that provide little value while consuming significant browser resources.

3. Cumulative Layout Shift (CLS)

Have you ever tried clicking a button only for the page to move just before you click it?

That's a classic layout shift.

Cumulative Layout Shift measures visual stability.

Google recommends a CLS score of 0.1 or less.

Common Causes of Poor CLS

CLS problems are often caused by:

Images without defined dimensions
Ads loading dynamically
Web fonts changing the layout
Embedded videos without reserved space
Dynamically injected content
Popups moving existing content
Banners appearing above existing content

How to Improve CLS

Reserve space for elements before they load.

For images, specify width and height or use an appropriate aspect ratio.

For advertisements and embeds, allocate the required space before the content appears.

Also avoid inserting important content above existing content after the page has started loading.

Cumulative Layout Shift CLS Optimization

How to Check Your Core Web Vitals

Before making changes, measure your website.

Don't start optimizing blindly.

Several tools can help you identify Core Web Vitals issues.

1. Google Search Console

Google Search Console includes a Core Web Vitals report that helps website owners identify groups of URLs experiencing performance problems.

It's particularly useful because it shows performance based on real user data where sufficient data is available.

Look for pages classified as:

Poor
Needs improvement
Good

Start with important pages rather than trying to fix every URL at once.

Your homepage, service pages, product pages, and high-traffic blog posts should usually receive priority.

2. PageSpeed Insights

PageSpeed Insights is useful for testing individual URLs and identifying potential performance improvements.

It combines real-world data where available with diagnostic testing.

Use it to investigate:

LCP
INP
CLS
JavaScript
CSS
Images
Server response
Caching
Third-party resources

3. Lighthouse

Lighthouse can help developers audit performance and identify technical opportunities for improvement.

Google recommends tools such as Search Console, PageSpeed Insights, and Lighthouse for measuring and improving page experience.

How to Improve Core Web Vitals

Improving Core Web Vitals isn't about applying one magic setting.

It usually requires several small improvements across the website.

1. Optimize Images

Large images are one of the most common causes of slow pages.

Before uploading an image:

Resize it to the required dimensions
Compress it
Use WebP or AVIF where suitable
Avoid unnecessarily large files
Use responsive image sizes
Lazy-load images that are below the fold

However, don't lazy-load the main above-the-fold image if doing so delays your LCP element.

2. Reduce Unnecessary JavaScript

Review the scripts installed on your website.

You may find scripts for:

Chat widgets
Heatmaps
Analytics
Advertising
Social media
Popups
A/B testing
Plugins

Not every script needs to load immediately.

Remove scripts you no longer use and delay non-critical scripts when possible.

This can improve both loading performance and responsiveness.

3. Improve Server Response Time

A website cannot load quickly if the server takes too long to respond.

Poor server performance can be caused by:

Cheap or overloaded hosting
Poor database queries
Lack of caching
Too many server-side processes
Poor website architecture

Improving hosting and server configuration can therefore have a major impact on website performance.

4. Use Browser Caching

Caching allows returning visitors to reuse resources that have already been downloaded.

Configure appropriate cache policies for:

Images
CSS
JavaScript
Fonts
Static assets

This reduces unnecessary downloads and can make repeat visits considerably faster.

5. Use a CDN

A Content Delivery Network can serve static files from locations closer to users.

This is particularly useful for businesses serving visitors across multiple countries.

For example, if your target audience includes users in the US, UK, Australia, and Europe, serving static assets through an appropriate CDN can reduce network latency.

6. Optimize Fonts

Fonts are often overlooked during performance optimization.

Using too many font families or weights can increase the number of files a browser needs to download.

Consider:

Reducing font variants
Using modern font formats
Preloading only critical fonts
Using font-display: swap
Removing unused fonts

The goal is to maintain your site's design without unnecessarily increasing page weight.

7. Remove Unnecessary Third-Party Scripts

Third-party scripts can become a hidden performance problem.

Examples include:

Advertising pixels
Analytics tools
Chat software
Social widgets
Tracking platforms
Marketing automation tools

This doesn't mean you should remove important tracking.

Instead, review every script and ask:

Does this script provide enough business value to justify its performance cost?

For websites running Google Ads or Meta Ads, accurate tracking remains important. The solution is to implement tracking correctly and efficiently rather than simply removing it.

If you need help with this area, you can explore our Conversion Tracking Services.

Core Web Vitals and Mobile SEO

Mobile performance deserves special attention.

Many visitors access websites through smartphones and mobile networks, where device processing power and connection quality can vary significantly.

A website that feels fast on a high-end desktop may feel slow on a mid-range smartphone.

That's why you should test your website on both:

Mobile
Desktop

Don't optimize only for your own device.

Google also recommends evaluating page experience holistically, including mobile usability, HTTPS, intrusive interstitials, and other factors alongside Core Web Vitals.

Core Web Vitals Mobile SEO Performance

Core Web Vitals and Google Ads Landing Pages

Core Web Vitals aren't only relevant to organic SEO.

They can also matter when you're paying for traffic.

Imagine spending money on Google Ads to attract potential customers and sending them to a page that takes five seconds to become usable.

You may be paying for the click, but losing the opportunity after the visitor arrives.

A strong landing page should therefore combine:

Fast loading speed
Clear messaging
Relevant content
Strong calls-to-action
Mobile-friendly design
Trust signals
Simple navigation
Accurate conversion tracking

If you're running paid campaigns, our Google Ads Management Services can help with campaign strategy, landing page performance, conversion optimization, and ongoing account management.

You can also read How to Generate Leads with Google Ads for more information about building a conversion-focused paid search strategy.

Core Web Vitals Are Only One Part of SEO

It's easy to become obsessed with PageSpeed scores.

A website owner may spend weeks trying to move a score from 92 to 100 while ignoring more important SEO problems.

That's usually the wrong approach.

Your SEO strategy should also cover:

Search intent
Keyword research
Helpful content
On-page SEO
Internal linking
Technical SEO
Website architecture
Structured data
Mobile experience
Crawlability
Indexability
Backlinks
Conversion optimization

Google's current guidance emphasizes creating helpful, reliable, people-first content rather than producing content primarily for search engines.

For a broader SEO strategy, check out our guide on How to Get Your First 1000 Organic Visitors.

Common Core Web Vitals Mistakes

Focusing Only on the Homepage

Your homepage may perform well while important service or product pages perform poorly.

Check your highest-value URLs individually.

Chasing a Perfect PageSpeed Score

A 100 score isn't the ultimate SEO objective.

Real-world user experience and business outcomes matter more than an arbitrary score.

Ignoring Mobile Performance

Desktop performance doesn't tell you how every mobile visitor experiences your website.

Always test both.

Installing Too Many Plugins

On CMS platforms, unnecessary plugins can add scripts, stylesheets, database queries, and other overhead.

Audit your plugins regularly.

Optimizing Without Measuring

Don't change ten things at once and assume performance improved.

Measure the page, identify the largest issue, make a change, and test again.

Core Web Vitals SEO Checklist

Use this quick checklist when auditing a website:

Final Thoughts

Core Web Vitals should not be treated as a standalone SEO trick.

They are part of building a website that loads quickly, responds properly, and remains stable while users interact with it.

The three metrics to focus on are LCP, INP, and CLS. Aim for LCP of 2.5 seconds or less, INP of 200 milliseconds or less, and CLS of 0.1 or less.

But don't lose sight of the bigger picture.

A fast website with poor content won't suddenly outrank a highly relevant competitor. Similarly, excellent content cannot always compensate for a frustrating website experience.

The strongest SEO strategy combines useful content, technical SEO, strong internal linking, good website performance, mobile usability, and a smooth user experience.

If you're looking to improve your website's organic visibility, our SEO Services can help identify technical and on-page issues while building a long-term search strategy.

And if you're looking for a broader performance marketing strategy across SEO, Google Ads, Meta Ads, and conversion tracking, visit Scale With Clicks.

Frequently Asked Questions

What are Core Web Vitals?

Core Web Vitals are Google's user-focused metrics for measuring loading performance, responsiveness, and visual stability. The current metrics are LCP, INP, and CLS.

What is a good Core Web Vitals score?

Google recommends an LCP of 2.5 seconds or less, INP of 200 milliseconds or less, and CLS of 0.1 or less for a good user experience.

Do Core Web Vitals directly improve Google rankings?

Core Web Vitals are used by Google's ranking systems, but achieving good scores does not guarantee higher rankings. Google evaluates many signals, including relevance and content quality.

How do I check Core Web Vitals?

You can use Google Search Console for site-level reporting and tools such as PageSpeed Insights and Lighthouse to investigate individual pages and performance issues.

Which Core Web Vital is most important?

There isn't one metric that is universally the most important. LCP, INP, and CLS measure different parts of the user experience, so ideally all three should meet Google's recommended thresholds.

How often should I check Core Web Vitals?

For important websites, monitor them regularly, especially after website redesigns, theme changes, plugin updates, hosting migrations, or major changes to JavaScript and tracking.

Can Core Web Vitals affect conversions?

Poor website performance can create friction for visitors and make it harder for them to complete important actions such as submitting forms, purchasing products, or booking services. Improving performance is therefore useful not only for SEO but also for conversion optimization.