sitespeed.io VS lighthouse ci action

I've always liked sitespeed.io.

High-scale performance gains are only valid if you test with realistic workloads that match your production traffic. Too many teams benchmark with 10 components on a fast WiFi network, then wonder why their app crashes under 1M DAU. Use the benchmark script we provided earlier to test with 10k+ components, throttled networks (3G, 4G, slow WiFi), and realistic concurrency (100+ req/s). Test both client-side and server-side metrics: TTI, FCP, LCP for client metrics; p99 latency, requests per second, memory usage for server metrics. For Astro apps, benchmark both SSG and SSR modes: SSG will always be faster for static content, but SSR is necessary for personalized content (e.g., logged-in user dashboards). Use Lighthouse CI to automate performance regression testing in your CI pipeline: set thresholds for LCP (<2.5s), FCP (<1.8s), and TTI (<3.8s) and fail builds that exceed them. In our case study, the e-commerce team caught a 400ms TTI regression before deploying by adding Lighthouse CI to their GitHub Actions pipeline, saving hours of debugging post-deployment. For cost benchmarking, use the AWS Pricing Calculator or Vercel’s cost estimator to project server costs for your traffic levels, as Astro’s lower resource usage can lead to significant savings at scale.

For audits and payload analysis we use Lighthouse — a built-in Chrome tool that generates a detailed performance report for any page. It’s useful for catching issues before they reach real users. For day-to-day development we use browser DevTools — the network and performance tabs show what’s happening in real time while we code.

Automated accessibility testing tools, such as axe-core by Deque, WAVE, Lighthouse are bit like a spellcheck for web accessibility. They are really useful for identifying and resolving many common accessibility issues quickly.

According to web.dev's Lighthouse documentation, a single Lighthouse run takes 15-45 seconds per page. If your checking 10 pages, thats 3-7 minutes added to your pipeline. Most teams will just skip it.

Lighthouse is an open-source, automated tool developed by Google that audits web page quality.

Lighthouse is an open-source tool for auditing web page quality, focusing on performance, accessibility, and SEO.

Lighthouse (Chrome DevTools) — audit SEO and performance

Slow-loading pages can stem from multiple causes, which makes them one of the most challenging issues to fix in web development. Lighthouse (LH) is Google’s free and open-source website auditing tool that can help you detect and solve your web performance issues and speed up your site.

We wanted to use next/font/google to implement the Inter Google Font for its magical ways of optimising font performance. We wanted a fast site with green Lighthouse scores. (Along with images, custom fonts are a major cause of poor site performance.)