Page Speed Revenue Loss Calculator
A 4-second site instead of a 2-second site costs you about 13% of conversions. See your number.
Page Speed Revenue Loss Calculator
Every extra second of load time costs conversions. Industry data: 7% drop per second. See your number.
Conversions lost / month
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Revenue lost / month
£—
Annual recovery if you fix it
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Based on widely-cited Akamai / Portent / Cloudflare benchmarks of ~7% conversion drop per additional second of load time. Real impact varies by industry.
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How to check your real load time
- PageSpeed Insights, Google's own tool, shows Core Web Vitals.
- WebPageTest, more detailed waterfall view.
- Google Search Console → Core Web Vitals report, shows real-user data from your actual visitors.
Common causes of slow sites
- Huge unoptimised images (the #1 cause).
- Too many plugins (WordPress especially).
- Render-blocking JavaScript and CSS.
- Heavy third-party scripts (chat widgets, analytics, retargeting tags).
- Cheap shared hosting.
Frequently asked questions
Where does the 7% per second figure come from? +
It's the widely-cited industry average from studies by Akamai, Portent, and Cloudflare. Real impact varies by industry, e-commerce sites tend to be at the higher end, brochure sites at the lower end.
How fast should my site actually be? +
Under 2.5 seconds Largest Contentful Paint (LCP) on mobile is Google's "Good" threshold. Under 1.5 seconds is excellent. Most UK small business sites currently sit at 3.5–6 seconds.
What's the cheapest way to make my site faster? +
Compress images (most sites have huge unoptimised JPEGs), enable browser caching, use a CDN (Cloudflare is free), and remove unused plugins. Those four usually shave 30–50% off load time.
Will hosting upgrade fix it? +
Sometimes, but the bigger wins are usually in the front end, image weight, render-blocking JavaScript, and font loading. Cheap shared hosting only becomes the bottleneck once everything else is fixed.