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Website speed converts directly into money: every 100 milliseconds of load time costs roughly 1% in conversions, a one-second delay costs about 7%, and 53% of mobile visitors abandon a slow site entirely. In 2026 the bar rose again — Google’s March core update tightened the "good" LCP threshold from 2.5 to 2.0 seconds and increased the weight of Core Web Vitals in rankings.
The numbers that end the debate#
- 91% of pages ranking #1 pass all three Core Web Vitals; on page two, only 47% do.
- Only 42% of mobile sites pass Core Web Vitals — while mobile carries 62% of e-commerce traffic. The gap is your opportunity.
- Rakuten 24 measured it in an A/B test: good LCP delivered +53% revenue per visitor and +33% conversion rate.
- For a shop doing €10M/year, a 500ms improvement is worth roughly €500,000 in recovered revenue.
Why most sites fail — and why ours do not#
Slow sites are usually slow by architecture: rendering everything in the browser, shipping megabytes of JavaScript for a page of text, hosting an ocean away from the visitor. Optimizing that afterwards is a rescue mission. Building it right costs nothing extra: static generation, zero JavaScript by default, edge delivery. Our builds load in under a second on real 4G — not because we optimize harder, but because there is barely anything to optimize.
Where the milliseconds actually go#
Slow sites share an anatomy: megabytes of JavaScript parsed before anything paints, render-blocking themes and page builders, unoptimized hero images, a queue of third-party tags (chat, analytics, pixels, consent tools) each taxing the main thread, and a server far from the visitor. The order matters because it explains why cosmetic fixes disappoint — compressing images on a site that ships 2MB of JavaScript is rearranging deck chairs.
Check your own site in five minutes#
- Run PageSpeed Insights and read the field data (real users), not just the lab score.
- Check the three vitals against 2026 thresholds: LCP under 2.0s, INP under 200ms, CLS under 0.1.
- Test on a real phone over mobile data — where 62% of e-commerce traffic actually lives.
- Compare against your two biggest competitors; speed is a relative advantage.
Speed is the only marketing investment that simultaneously improves rankings, ad costs, conversion and user happiness. Nothing else on the invoice does all four.
Frequently asked questions#
How fast is "fast enough" in 2026?
LCP under 2.0 seconds on mobile is the new "good" threshold. In practice, aim for a site that feels instant — under one second on 4G — because thresholds keep tightening.
Can I fix a slow site without rebuilding?
Images, caching and hosting can often be patched for real gains. But if the architecture ships megabytes of JavaScript before showing content, a rebuild on a modern stack usually costs less than endless optimization sprints.
Does speed affect paid advertising too?
Directly. Google Ads factors landing-page experience into Quality Score, so slow pages pay more per click — and then convert fewer of the visitors they paid for. Faster pages cut acquisition cost from both ends.