What does this website speed test check?
This free website speed test runs Google's PageSpeed Insights mobile test on your page. It reports your Lighthouse performance score (0–100) and your Core Web Vitals: Largest Contentful Paint (LCP), Cumulative Layout Shift (CLS), and Interaction to Next Paint (INP) or Total Blocking Time. When Google has enough real-visitor data from the Chrome UX Report, it shows that too, then estimates what slow loading may be costing you in conversions.
It works on any public page, including WordPress, Shopify, Wix and Squarespace sites. Results are saved to a link you can share with whoever manages your site.
What's a good website speed score?
Google's Core Web Vitals thresholds are what matter most, because they measure what visitors experience. A page passes when 75% of visits meet the "good" level:
| Metric | Good | Needs improvement | Poor |
|---|---|---|---|
| LCP (how fast the main content appears) | 2.5 s or less | 2.5–4 s | Over 4 s |
| INP (how fast the page responds to a tap or click) | 200 ms or less | 200–500 ms | Over 500 ms |
| CLS (how much the layout jumps) | 0.1 or less | 0.1–0.25 | Over 0.25 |
The Lighthouse score is a lab test on a simulated phone. It's useful for catching regressions, but it isn't the same as passing Core Web Vitals: a page can score well in the lab and still fail with real visitors. Core Web Vitals explained covers each metric in plain English.
Why test on mobile?
Google uses the mobile version of a page for indexing and ranking, and phones on mobile networks are where slow pages hurt most. That's why this audit runs PageSpeed Insights' mobile test by default. If your desktop score is fine but mobile isn't, the mobile result is the one to fix.
How is the revenue-loss estimate worked out?
The audit compares your LCP to Google's 2.5-second "good" threshold. For each second beyond it, it applies Portent's finding that conversion rates fell about 4.42% per extra second of load time (measured for pages loading in 0–5 seconds), as a relative drop. Add your monthly revenue and it turns the percentage into dollars. It's an illustrative range, not a guarantee; does website speed affect conversions? looks at the wider research, and what slow load times are costing your business puts it in context.
How do you run a WordPress speed test and fix what it finds?
Paste your homepage or a key product or service page into the audit. On WordPress, the findings usually trace back to a handful of causes:
- Large images. Serve WebP or AVIF at the size they're displayed, and lazy-load images below the fold.
- Too many plugins loading everywhere. Page builders, sliders and form plugins often load their files on every page. An asset manager can switch them off where they aren't used.
- No page caching. A caching plugin or host-level cache stops WordPress rebuilding every page on every visit.
- Slow hosting. A long server response time on every page points at the host. The hosting cost calculator shows what the next tier costs.
- Third-party scripts. Chat widgets, pixels and embeds loading early can delay everything else. Load them after the page is usable.
Why is my website so slow? goes through each fix, and do you need a CDN? covers when one helps.
Does page speed affect SEO?
Yes, though modestly. Core Web Vitals are part of Google's page experience signals, but relevance and content quality matter more. A slow page rarely drops from page one on speed alone, while a fast page won't outrank a more useful one. The bigger cost is usually in conversions. Does page speed affect SEO? explains what Google has said.
Which speed test tool should you use?
PageSpeed Insights (which this audit uses) is the one to trust for Core Web Vitals, because it includes Google's real-visitor data. GTmetrix and WebPageTest give more detail on how a page loads, which helps when you're debugging. Website speed test tools compared explains when to use each.
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