Why Website Speed ​​Directly Impacts Revenue

Website speed is more than a technical metric—it has a measurable impact on revenue.

A well-known experiment by Vodafone Italy compared two identical landing pages. The only difference was that one loaded around 31% faster . After splitting approximately 100,000 daily visitors between the two versions, the faster page generated 8% more sales . Similarly, Rakuten 24 reported significant increases in revenue after improving Core Web Vitals, while Deloitte's research for Google found that even a 0.1-second improvement in page speed was associated with higher conversion rates and average order values.

However, these figures should not be treated as guaranteed results for every business. Vodafone's findings applied to a specific campaign, audience, and industry. Instead of focusing on exact percentages, businesses should recognize that website performance is a genuine factor influencing user behavior and revenue.

The greatest returns usually come from improving websites with poor performance rather than making already fast websites slightly faster. Google currently recommends achieving:

• Largest Contentful Paint (LCP): under 2.5 seconds

• Interaction to Next Paint (INP): under 200 milliseconds

• Cumulative Layout Shift (CLS): below 0.1

If your website consistently fails these Core Web Vitals, performance optimization is often one of the highest-return technical investments you can make.

In many cases, slow websites are not caused by poor hosting alone. Instead, performance issues accumulate over time through oversized images, unnecessary third-party scripts, outdated plugins, excessive tracking tools, unoptimized fonts, and intrusive widgets. Individually these issues may seem minor, but together they can add several seconds to page load time.

It's also important to remember that Google measures Core Web Vitals using real user data collected over a rolling 28-day period . As a result, improvements may appear immediately in tools like Lighthouse but can take several weeks to be reflected in Google Search Console.

Finally, website speed is only one part of conversion optimization. A fast website with confusing messaging, weak calls to action, or a poor user experience will still struggle to convert visitors. Before investing in performance improvements, review your real-world Core Web Vitals data. If your site is underperforming, speed optimization can deliver meaningful business value. If your metrics are already strong, you're likely to see greater returns by improving your content, user experience, and conversion strategy instead.

Website speed reduces friction, improves user experience, and supports better business outcomes—but it should always be considered alongside clarity, trust, and usability to maximize revenue.