AI Website Builder Benchmarks

Website performance directly impacts user experience, search engine rankings, and conversion rates. But when you use an AI website builder, you have less control over the underlying code and server infrastructure than with custom development. This makes it essential to understand how different AI builders perform in real-world conditions. We tested all major AI website builders across key performance metrics including page load time, Time to First Byte (TTFB), Lighthouse scores, and Core Web Vitals. This comprehensive benchmark report reveals which builders produce the fastest websites and provides actionable insights for optimizing your AI-built site regardless of which platform you choose.

How We Tested

We created identical test websites on each AI builder platform using their AI generation feature with the same prompt. Each site included a homepage, about page, services page, and contact page with equivalent content, images, and navigation structure. We tested each site using Google PageSpeed Insights, GTmetrix, and WebPageTest from multiple locations and on both mobile and desktop devices. Tests were conducted on standard shared hosting plans (each builder default tier) during the same time period to ensure fair comparison. We measured Lighthouse performance scores, First Contentful Paint (FCP), Largest Contentful Paint (LCP), Cumulative Layout Shift (CLS), and Total Blocking Time (TBT).

Performance Rankings: Mobile

In mobile performance testing, Carrd AI and Hostinger AI consistently delivered the fastest load times, with Lighthouse scores averaging 92-96. Their lightweight approach and minimal JavaScript result in excellent mobile performance. Framer AI and Webflow AI scored slightly lower (85-90) due to their more complex animation systems and design features. Wix AI and Squarespace AI scored in the 80-88 range, which is good but leaves room for optimization. 10Web AI scored 88-93, benefiting from its Cloudflare CDN integration. Durable AI scored 82-87, and Jimdo AI scored 85-90. All builders achieved mobile LCP under 3 seconds, though Carrd and Hostinger were notably faster at under 1.5 seconds.

Performance Rankings: Desktop

Desktop performance was stronger across all builders, with most scoring 90+ on Lighthouse. Carrd AI (98), Hostinger AI (95), and 10Web AI (94) led the desktop rankings. Framer AI (92) and Webflow AI (93) performed well on desktop where their animation systems have more processing headroom. Wix AI (90), Squarespace AI (91), and Durable AI (89) were competitive. The desktop performance gap between builders is smaller than on mobile, suggesting that mobile optimization is where builder choice matters most for performance-sensitive applications.

What Affects AI Builder Performance

Several factors explain the performance differences between AI builders. Code weight matters: builders that generate leaner HTML, CSS, and JavaScript produce faster sites. Server infrastructure and CDN quality affect TTFB and asset delivery speed. Image optimization capabilities determine how quickly visual content loads. Third-party script loading (analytics, chat widgets, embeds) adds weight to every page. The more design features and animations a builder supports, the more code it includes by default. Builders like Carrd that focus on simplicity naturally produce faster sites, while feature-rich builders like Wix and Squarespace include more code to support their extensive capabilities.