53% of visitors leave a site that takes more than 3s to load (Google)
Google measured that a site going from 1 to 3 seconds of load time sees its bounce rate rise by 32%. At 5 seconds, it's +90% bounce (Think with Google). Speed isn't a technical luxury — it directly impacts the number of leads you generate.
The numbers: every second costs you money
According to Google (Think with Google), 53% of mobile visitors abandon a site that takes more than 3 seconds to load. Google also measured that going from 1 to 3 seconds increases the probability of a bounce by 32%, and from 1 to 5 seconds by 90%. According to Portent (2022), an e-commerce site that loads in 1 second has a conversion rate 2.5 times higher than a site that loads in 5 seconds. Deloitte measured that a 0.1-second improvement on mobile increases conversions by 8.4% in retail. Speed has a direct and measurable impact on your sales.
Why your site is probably too slow
The most common causes: uncompressed images (a 5 MB photo instead of 200 KB), too many WordPress plugins (each plugin adds code), cheap shared hosting (shared with hundreds of other sites), unoptimized JavaScript, web fonts loaded all at once. An average WordPress site loads 30 to 50 HTTP requests. An optimized Next.js site loads 5 to 10.
How to measure your site's speed (free)
Use Google PageSpeed Insights (free, type "pagespeed insights" into Google). Enter your site's URL and look at the score. Green (90-100): excellent, your site is fast. Orange (50-89): needs improvement, you're losing customers. Red (0-49): critical, you're losing a lot of money. Also look at the LCP (Largest Contentful Paint): it should be under 2.5 seconds for Google to favor you.
7 concrete solutions to speed up your site
1. Compress your images (use the WebP format, 80% weight reduction). 2. Use a CDN (global distribution network, free with Vercel/Cloudflare). 3. Enable browser caching. 4. Minify your CSS and JavaScript (remove unused code). 5. Choose high-performance hosting (Vercel = free + fast). 6. Use lazy loading for off-screen images. 7. Remove unnecessary plugins (every plugin removed = a faster site).
Next.js: fast by default, effortlessly
This is the main reason I build in Next.js. The framework includes natively: automatic image compression (WebP, AVIF), lazy loading, code splitting (only the necessary code is loaded), static pre-rendering (pages are generated in advance) and Vercel's global CDN (your site is distributed across 70 countries). The result: a PageSpeed score of 90+ with no extra effort. Your visitors stay, your conversions rise, your revenue rises.
Speed is also free SEO
Google uses speed as a ranking factor. A fast site appears higher in the results than a slow one, all content being equal. Higher in Google = more visitors = more customers = more revenue. It's a virtuous circle: by investing in speed, you gain free traffic through SEO, which makes you money without spending on advertising.
In short
Your site's speed has a direct and measurable impact on your revenue. A site that loads in 1.5 seconds instead of 4 can double your conversions — and therefore your revenue. The most effective solution is to switch to Next.js, which delivers optimal performance by default. It's an investment that pays for itself from the very first month.