Amazon famously calculated that 100ms of added latency cost 1% of sales. Aggregated studies since put the average at roughly 7% conversion loss per extra second of load time. If your store does $20k/month and loads in 4 seconds instead of 2, you're likely leaving $2–3k on the table monthly.
The five fixes with the highest return: compress and modernize images (AVIF/WebP with proper sizing), eliminate render-blocking third-party scripts, ship modern fonts with font-display swap, cache aggressively at the CDN edge, and cut JavaScript bundles by removing dead dependencies.
Measure before and after with real-user data (CrUX, Vercel Analytics) rather than lab-only Lighthouse runs — Google ranks you on what real users experience. Green Core Web Vitals also correlate with better crawl budgets and AI-engine citation rates.
We run performance rescues as a fixed-price package: audit, fix, and a before/after report tied to your conversion data — so you can see exactly what the speed gain is worth to your business.
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