Speed Observatory & Revenue Previews
Measure performance improvements and projected revenue gains with real-world Before & After synthetic audits.
Before vs. After Benchmarks
fast.site automatically tests your website with and without edge acceleration, capturing Largest Contentful Paint (LCP), Speed Index, and Total Blocking Time.
Measures your un-accelerated origin response time, uncompressed assets, and standard Time to First Byte (TTFB).
Measures edge caching under 5ms, automatic AVIF/WebP image optimization, Brotli compression, and HTML preloading.
Mobile vs. Desktop Analysis
Toggle between mobile and desktop test runs. Because mobile visitors represent over 60% of web traffic, fast.site isolates mobile performance bottlenecks.
Mobile-First Lighthouse Audits
Audited using simulated 4G mobile throttling to match real-world mobile traffic.
Revenue & Conversion Boost Calculator
Every 100ms improvement in page speed directly improves conversion rates. fast.site models your current traffic and predicts incremental monthly revenue based on reduced latency.