Core Web Vitals Explained for Singapore SMEs

If you’ve heard someone mention Core Web Vitals and wondered what it means for your business, this guide explains it without the technical language. These three measurements affect where your website appears in Google search results — which directly affects how easily potential customers find you.

What Core Web Vitals Are

Core Web Vitals are three numbers that Google measures to understand how a website feels to use on a phone. They were introduced by Google as part of how it decides which websites to rank higher in search results.

Think of them as a customer experience score. A site that loads quickly, responds immediately when you tap, and doesn’t have buttons jumping around is a better experience than one that doesn’t. Google rewards the better experience with higher placement in search.

You don’t need to understand the technical mechanics. What matters for your business is knowing what the three numbers are, what a good score looks like, and how to check yours.

The Three Vitals in Plain English

LCP — How Long Until You Can See the Main Thing

LCP stands for Largest Contentful Paint. Strip away the name and it means: how many seconds does it take until the main content on your page is visible? Usually that’s your headline, your main image, or your hero section.

When someone taps your site on their phone and waits, LCP is what they’re waiting for. A long wait means they may tap the back button before your page finishes loading.

• Good: under 2.5 seconds
• Needs improvement: 2.5 to 4 seconds
• Poor: over 4 seconds

Most people expect a page to feel usable within 2 seconds. Beyond 3 seconds, a significant share of visitors leave.

INP — How Fast the Page Reacts When You Tap

INP stands for Interaction to Next Paint. It measures what happens after you tap something — a button, a menu item, a link. How quickly does the page respond?

At 200ms, the response feels instant. You tap, it happens. At 500ms and above, there’s a noticeable delay — you tap, you wait, then it responds. This sluggishness erodes trust, particularly on contact forms and booking flows where the visitor is trying to take action.

• Good: under 200ms
• Needs improvement: 200ms to 500ms
• Poor: over 500ms

CLS — How Much Stuff Jumps Around While It Loads

CLS stands for Cumulative Layout Shift. It measures whether elements on a page move around while it’s still loading.

You’ve experienced this: you’re about to tap a button, and it shifts down the screen just as your finger arrives, and you accidentally tap the wrong thing. That’s layout shift. It’s frustrating on a desktop and worse on a phone.

CLS is measured as a number rather than in seconds. Lower is better.

• Good: below 0.1
• Needs improvement: 0.1 to 0.25
• Poor: above 0.25

Why Singapore SMEs Should Care

There are two practical reasons this matters for your business.

Reason one: Google rankings. Google officially uses Core Web Vitals as a ranking signal. All else being equal, a site that loads faster and feels better on mobile will rank higher than one that doesn’t. For a local Singapore business competing for search visibility, this is a real edge — and one that many competitors haven’t addressed.

Reason two: Singapore is a mobile-first market. More than 70% of web traffic in Singapore comes from mobile devices. That means most of the people visiting your site are on a phone, on the go, often on a mobile connection. A site that works well on a desktop but loads slowly on mobile is effectively invisible to a large share of your potential customers.

The two reasons connect: a poor mobile experience hurts your rankings, which means fewer people find you, and the ones who do find you through other channels often leave before they make contact.

Field Data vs Lab Data: What’s the Difference?

When you check your site’s score, you may see two different types of data referenced, and it helps to understand the distinction.

Field data (also called real-user data) comes from actual visitors to your site. Google collects this anonymously through Chrome browsers and uses it to understand how your site performs for real people in real conditions. This is the most accurate picture of what your visitors actually experience.

Lab data (also called a Lighthouse score) is a simulated test. Google’s tool runs a controlled test on a virtual device and network, scores it from 0 to 100, and gives you the three Core Web Vitals measurements. This is what you see when you run a test on pagespeed.web.dev.

For most small and medium business websites, field data isn’t available — your site simply doesn’t get enough monthly visitors for Google to have meaningful real-user data. That’s normal. In that case, the Lighthouse score is your main reference point, and it’s still a useful measure of your site’s technical health.

For a deeper walk-through of why the lab score and what real visitors experience can differ — and when the gap matters — see our sister site’s Why Your Real Users Are Fast But PageSpeed Says You’re Slow.

How to Check Your Score in 2 Minutes

You don’t need a developer or any paid tools. Here’s the process:

Step 1: Go to pagespeed.web.dev in any browser.

Step 2: Type or paste your website address into the box and press Analyse.

Step 3: Wait about 30 seconds while the tool runs the test.

Step 4: Look at the Mobile tab. This is important — the Desktop tab usually shows a much higher score because the test runs on a faster simulated device. Your customers are using phones.

You’ll see an overall score from 0 to 100 and the three Core Web Vitals measurements below it. Each will show either Good (green), Needs Improvement (orange), or Poor (red).

How to read the overall score:

Benchmark Context for PSG Buyers

If you’re evaluating PSG-approved vendors, knowing the industry benchmark helps you interpret what you’re seeing.

In April 2026, we measured the mobile Lighthouse scores of 278 PSG-approved vendors. Here’s what we found:

• The median score was 47 out of 100 — meaning more than half of PSG vendors score below 50
• Only 9 vendors (about 3%) scored 90 or above
• The majority of vendors fall in the 30–60 range

This context matters. If you check a vendor’s site and it scores 65, that vendor is already performing better than the majority of PSG-approved vendors. A score of 80 puts them in genuinely rare company.

It also means you shouldn’t be surprised to find low scores — they are the norm, not the exception. Use this as one data point in your evaluation, not as the only factor.

For more on how to use this in a vendor conversation, see our guide to evaluating PSG vendor site speed.

What to Do With This Information

If you’re checking your own site and the score is low, the most direct path forward is to raise it with your web developer or your current website provider. A Lighthouse score below 50 on mobile is a concrete, measurable problem — not an opinion — and it has specific technical causes that a developer can address.

If you’re comparing PSG vendors, the score gives you a useful, objective data point to add to your evaluation. A slow vendor site isn’t a disqualifier, but a vendor who can explain their performance clearly and tell you how they’ll manage yours is demonstrating more than just technical competence — they’re showing accountability.

Grantla’s PSG solution pages include each vendor’s mobile performance score directly in the listing, so you can compare vendors without running the test manually yourself.

Related Guides

• How to Check a PSG Vendor’s Website Speed — the 2-minute buyer’s checklist, including what to ask vendors
• 8 Red Flags When Shortlisting PSG Vendors — other pre-sales warning signs beyond site speed
• Is PSG Worth It? — honest ROI assessment before you apply
• PSG Grant Explained — full eligibility, process, and claim steps
• Common Grant Pitfalls — mistakes to avoid when applying for Singapore grants
• Singapore Grants Glossary — key grant terms and definitions
• 本指南中文版 — 新加坡中小企业Core Web Vitals简明指南（中文）