Test Your Website Speed
Mobile and desktop scores, real-visitor Core Web Vitals, and a plain-English list of what to fix, powered by Google PageSpeed Insights
Why Website Speed Matters
SEO Rankings
Google uses Core Web Vitals from real visitors as part of its page experience signals. A slow site gives competitors an edge in search, and a fast one helps you win ties.
Conversion Rates
Amazon found that every 100ms of latency cost them 1% in sales. Faster pages keep visitors moving toward a call, a booking, or a purchase instead of the back button.
Bounce Rate
Google research found 53% of mobile visitors leave a page that takes longer than 3 seconds to load. A slow website means potential customers leave before seeing your content, products, or services.
Mobile Experience
Most web traffic now comes from phones, often on slower connections. Google indexes the mobile version of your site first, so your mobile results matter most.
Understanding Core Web Vitals
Largest Contentful Paint
Loading: how long until the main content is visible, usually your hero image or headline. Good is 2.5 seconds or less; over 4 seconds is poor.
Interaction to Next Paint
Responsiveness: how quickly the page visibly reacts to taps, clicks, and typing across the whole visit. Good is 200 ms or less; over 500 ms is poor. INP replaced First Input Delay (FID) as a Core Web Vital in March 2024. Heavy JavaScript is the usual cause of a slow INP.
Cumulative Layout Shift
Visual stability: how much content jumps around while the page loads. Good is 0.1 or less; over 0.25 is poor. Images without dimensions, ads, and late-loading fonts are the common culprits.
Lab score vs. real-visitor data
The Performance score comes from a single lab test: Google loads your page once on a simulated mid-range phone over a slow 4G connection. It's great for finding problems, but it's intentionally strict and can move a few points between runs.
The Core Web Vitals assessment comes from real Chrome users who visited your site over the last 28 days. That's what Google uses in search rankings. It's common for a busy site to pass Core Web Vitals while scoring low in the lab, and smaller sites often don't have enough visitors yet for real-user data.
Common Speed Issues We Find
- Oversized images: photos uploaded straight from a camera or phone, not compressed or served in modern formats like WebP or AVIF
- Render-blocking files: CSS and JavaScript that must download before anything appears
- Too many plugins and third-party scripts: chat widgets, trackers, and page builders that each add weight
- Slow hosting: a Time to First Byte over 800 ms usually points to the server or missing page caching
- Web font issues: invisible text while fonts load, or layout jumps when they swap in
Need Help Improving Your Website Speed?
Sanden Solutions can optimize your website for better performance and a better visitor experience
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