Free Website Speed Test — Check Your Core Web Vitals
Page speed is no longer a nice-to-have — it is a hard ranking factor and a direct conversion driver. Every 100-millisecond delay in load time can reduce conversions by up to 7%, and Google's Core Web Vitals are now baked into its search ranking algorithm. Whether you're running an eCommerce store, a local service business, or a content site, how fast your pages load determines whether visitors stay or bounce — and whether Google sends you traffic at all.
This free website speed test tool runs a real Google Lighthouse audit through the PageSpeed Insights API, giving you the same performance data Google uses to evaluate your site. You'll see your overall performance score, your Core Web Vitals breakdown, and the top improvement opportunities ranked by how much load time each fix could save you.
Why Page Speed Matters for SEO in 2026
Google introduced Core Web Vitals as an official ranking signal in 2021, and the weight of that signal has only grown since. By 2026, fast-loading pages benefit from a compounding advantage: they rank higher, earn more clicks, keep visitors longer, and convert at higher rates — while slow pages sink in the SERPs regardless of their content quality.
The algorithm looks at real-world Chrome user data (the Chrome User Experience Report, or CrUX) for your URLs. If your site consistently delivers poor LCP, high CLS, or sluggish INP scores across real users, it signals to Google that the experience is bad — and rankings drop accordingly.
Beyond rankings, speed is a trust signal. A site that loads instantly feels professional and credible. A site that takes five seconds to load — or shifts around as elements pop in — feels broken, even if the content is excellent. For service businesses especially, that first impression is often the difference between a lead and a bounce. If you need help with your site's SEO foundation, explore Sprout Sage's SEO services.
Understanding Core Web Vitals: LCP, INP, CLS
Google measures three Core Web Vitals. Each one captures a different dimension of real-user experience:
- LCP — Largest Contentful Paint: Measures how quickly the largest visible element (usually a hero image or above-the-fold heading) loads. Good: under 2.5 seconds. Needs improvement: 2.5–4.0 s. Poor: above 4 seconds.
- INP — Interaction to Next Paint: Replaced FID in March 2024. Measures how responsive the page is to all user interactions (clicks, taps, keyboard input). Good: under 200 ms. Needs improvement: 200–500 ms. Poor: above 500 ms.
- CLS — Cumulative Layout Shift: Measures visual stability — how much the layout jumps around as the page loads. Good: under 0.1. Needs improvement: 0.1–0.25. Poor: above 0.25.
All three are measured in the field (real user data) via CrUX, and in the lab (synthetic) via Lighthouse. The PageSpeed Insights report this tool uses shows both. Field data reflects actual visitor experiences; lab data helps you diagnose what to fix. Aim for green on all three to maximize your performance benefit.
What's a Good Page Speed Score?
Google Lighthouse scores performance on a 0–100 scale. The scoring is weighted: some metrics (like LCP and Total Blocking Time) carry more weight than others. Here's how to interpret your score:
- 90–100 (Good): Your page is fast. You're likely already benefiting from the performance ranking signal. Focus on maintaining this as you add content.
- 50–89 (Needs Improvement): You're in the large middle ground where most sites live. There are meaningful wins available. Prioritize the highest-savings opportunities first.
- 0–49 (Poor): Your site has significant performance issues that are almost certainly costing you rankings and conversions. This should be treated as an urgent technical problem.
It's worth noting that mobile scores are almost always lower than desktop scores — sometimes dramatically so. Google simulates a mid-range Android device on a 4G connection for mobile tests. Since Google primarily uses mobile-first indexing, your mobile score is the one that matters most for SEO. A desktop score of 95 with a mobile score of 40 is a serious problem.
The Accessibility, Best Practices, and SEO scores shown alongside Performance are also worth reviewing — especially the SEO score, which reflects basic on-page factors like meta tags, crawlability, and mobile-friendliness. If you need a full technical website design review, I can help with that too.
Quick Wins to Improve Page Speed
Most websites have a handful of high-impact fixes that account for the majority of their performance problems. Here are the most common opportunities:
- Serve images in next-gen formats: Switch from JPEG/PNG to WebP or AVIF. Modern formats deliver the same visual quality at 25–50% smaller file sizes. This is typically the single largest win on image-heavy sites.
- Properly size images: Don't load a 2000px image to display it at 400px. Serve images at the size they actually display. Use responsive images (
srcset) for different screen sizes. - Eliminate render-blocking resources: JavaScript and CSS loaded in the
<head>block the browser from painting the page. Defer non-critical JS, inline critical CSS, and async-load third-party scripts. - Enable text compression: Ensure Gzip or Brotli compression is enabled on your server. This reduces the transfer size of HTML, CSS, and JS by 60–80%.
- Leverage browser caching: Set long cache TTLs for static assets (images, CSS, JS). Returning visitors will load cached versions instantly.
- Reduce server response time (TTFB): A slow server is the root cause of slow LCP. Upgrade to better hosting, use a CDN, enable server-side caching (like WP Rocket or LiteSpeed for WordPress), and optimize database queries.
- Reduce unused JavaScript and CSS: Audit and remove plugins, scripts, or stylesheets that aren't needed on every page. Code splitting and conditional loading can dramatically reduce initial payload.
The improvement opportunities shown in your test results above are ranked by estimated savings — start with the top ones for maximum impact. If you want these fixed for you, book a free consultation and I'll walk you through exactly what needs to happen on your specific site.
How Speed Affects Conversion Rates
The correlation between page speed and conversion rate is one of the most well-documented relationships in digital marketing. Google's own research shows that as page load time goes from 1 second to 3 seconds, the probability of a mobile visitor bouncing increases by 32%. At 5 seconds, that probability jumps 90%. At 10 seconds, it's 123%.
For eCommerce sites, Walmart found that every 1-second improvement in page load time increased conversions by 2%. For Amazon, a 100-millisecond delay was estimated to cost 1% of sales. For smaller businesses, the impact is often even higher — a local service site bouncing 60% of visitors because it loads slowly in 6 seconds is leaving a massive amount of leads on the table.
CLS deserves special attention from a conversion standpoint. When page elements shift around as they load — buttons move, text reflows, forms jump — users lose confidence and often abandon the interaction. A CLS score above 0.1 typically means your page feels broken to mobile users, even if it renders correctly on desktop.
Improving site speed is one of the highest-ROI technical investments a business can make. Unlike ad spend, a faster site keeps paying dividends 24/7. Every visitor gets a better experience, bounce rates drop, session durations increase, and conversion rates improve — all from infrastructure work that doesn't require ongoing spend. Ready to fix your site's speed? Let's talk.
