Why You Should Check Core Web Vitals Before Hiring a Developer
If your website feels slow, ranks poorly, or loses visitors before they even see your offer, there’s a good chance your Core Web Vitals are to blame. The good news? You don’t need to be a developer to diagnose the problem. With a few free tools and about 20 minutes, you can pinpoint exactly what’s dragging your site down and decide whether it’s a quick fix or a job for a professional.
This practical guide walks you through how to check Core Web Vitals scores yourself, understand what the metrics actually mean, and interpret the results with confidence. It’s written for small business owners, marketers, and site managers who want real answers, not jargon.
What Are Core Web Vitals, Really?
Core Web Vitals are three specific metrics Google uses to measure the real-world user experience of your website. They influence your search rankings and, more importantly, your visitors’ willingness to stay on the page.
The three metrics you need to know
| Metric | What it measures | Good score |
|---|---|---|
| LCP (Largest Contentful Paint) | How long it takes for the main content to appear | Under 2.5 seconds |
| INP (Interaction to Next Paint) | How quickly the page responds when a user clicks or taps | Under 200 ms |
| CLS (Cumulative Layout Shift) | How much the page visually shifts while loading | Under 0.1 |
Note: If you’ve read older articles mentioning FID (First Input Delay), Google officially replaced it with INP in March 2024. INP is now the responsiveness metric you should focus on.
Step 1: Check Core Web Vitals with PageSpeed Insights
PageSpeed Insights is Google’s own free tool and the fastest way to get a snapshot of your site’s performance.
- Go to pagespeed.web.dev.
- Paste your full page URL (for example, https://yourwebsite.com/services).
- Click Analyze and wait about 15 seconds.
- Review the two tabs at the top: Mobile and Desktop. Always start with Mobile, since that’s what Google uses to rank your site.
How to read the results
You’ll see two sections: Core Web Vitals Assessment (real user data from the last 28 days) and Diagnose performance issues (a lab test simulated on Google’s servers).
- Green means you passed, keep it up.
- Orange means the metric needs improvement.
- Red means it’s failing and hurting your rankings.
If the top section says “The Chrome User Experience Report does not have sufficient real-world speed data for this page”, don’t panic. It just means your site doesn’t get enough traffic yet for Google to collect field data. Rely on the lab data below instead.
Step 2: Check Core Web Vitals in Google Search Console
PageSpeed Insights tests one page at a time. Search Console gives you a site-wide view, which is essential if you have more than a handful of pages.
- Log into Google Search Console.
- In the left menu, click Experience > Core Web Vitals.
- You’ll see two reports: Mobile and Desktop.
- Click Open Report on either one to see which URLs are grouped as Poor, Needs Improvement, or Good.
The real value here is that Search Console groups similar URLs together. If 40 product pages all fail LCP for the same reason, you’ll see them in one bucket, and fixing the shared template fixes them all at once.
Step 3: Interpret What Each Metric Is Telling You
If LCP is bad
The largest element on your page (usually a hero image, banner, or main headline block) is taking too long to load. Common causes include: There’s a good explainer over at seoreviewtools.com.
- Uncompressed or oversized images
- Slow hosting or server response times
- Render-blocking JavaScript or CSS
- Missing image preloading
If INP is bad
Your page feels sluggish when visitors interact with it. This often points to:
- Too many third-party scripts (chat widgets, analytics, ad networks)
- Heavy JavaScript execution
- Bloated page builders with unused code
If CLS is bad
Elements on your page are jumping around as it loads, which is frustrating and can cause misclicks. Typical culprits: See sitecare.com for their take.
- Images without defined width and height attributes
- Ads or embeds that load in and push content down
- Web fonts that swap and cause text reflow
Step 4: Cross-Check with a Second Tool
It’s smart to verify your findings with a second source. Here are three reliable free options:
- DebugBear free Core Web Vitals checker, great for detailed lab breakdowns
- SpeedVitals, useful for seeing historical trends over 28 days, 6 months, and 12 months
- GTmetrix, gives a waterfall view of every resource loading on your page
If two different tools flag the same issue, you can be confident that’s a real problem worth fixing.
Step 5: Decide What You Can Fix Yourself
Some Core Web Vitals issues have easy DIY fixes. Others require a developer. Here’s a rough guide:
| Issue | DIY-friendly? |
|---|---|
| Compressing images | Yes, use TinyPNG or a plugin |
| Removing unused plugins | Yes |
| Enabling caching | Yes, most caching plugins are one-click |
| Upgrading hosting | Yes |
| Deferring JavaScript | Sometimes, depends on your setup |
| Rewriting theme code | No, hire a developer |
| Fixing server response time | No, hire a developer or switch hosts |
Bonus Tip: Test Under Real Conditions
Always run your Core Web Vitals check on a page that represents typical traffic, not just your homepage. Test your top three landing pages, your best-selling product page, and your contact page. These are usually where the money is made or lost.
Also, retest after any major change: a new plugin, a redesign, a new tracking script, or a hosting move. Performance can degrade silently, and by the time you notice a ranking drop, you’ve already lost weeks of traffic.
Frequently Asked Questions
How often should I check Core Web Vitals?
For most small business sites, once a month is enough. If you run an active blog or ecommerce store, check every two weeks and after any significant change to your site.
Why do my mobile scores differ so much from desktop?
Google tests mobile with a simulated mid-tier phone on a slow 4G connection. Desktop uses a fast broadband connection. Since mobile is the default for ranking, focus your fixes there first.
Is a 100 PageSpeed score realistic?
Not really, and it’s not necessary. Aim for green scores across all three Core Web Vitals metrics. A performance score above 90 on mobile is excellent for a real-world business site.
What if PageSpeed Insights shows no field data?
Your site doesn’t have enough Chrome user traffic yet. Use the lab data provided in the same report, and complement it with a tool like DebugBear or GTmetrix for deeper insight.
Do Core Web Vitals really affect SEO?
Yes. They’re part of Google’s page experience signals. They rarely make or break rankings on their own, but between two similar sites, the faster one usually wins. And beyond SEO, faster pages convert better, period.
Final Thoughts
Learning how to check Core Web Vitals yourself puts you in control. You’ll know exactly what’s wrong before you talk to a developer, which means better conversations, faster fixes, and no more paying for vague “speed optimization packages.” Start with PageSpeed Insights today, cross-check with Search Console, and take action on the low-hanging fruit first. Your visitors, and your rankings, will thank you.