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Top 4 JavaScript Performance analysis Projects
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Project mention: Preact vs Astro 4: The Performance Battle benchmark in High-Scale | dev.to | 2026-05-07
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.
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sitespeed.io
sitespeed.io is an open-source tool for comprehensive web performance analysis, enabling you to test, monitor, and optimize your website’s speed using real browsers in various environments.
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NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
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Scalene: A Python CPU/GPU/memory profiler with optimization proposals
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A note from our sponsor - SaaSHub
www.saashub.com | 9 Jun 2026
Index
What are some of the best open-source Performance analysis projects in JavaScript? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | lighthouse ci action | 30,320 |
| 2 | sitespeed.io | 4,985 |
| 3 | webperf-snippets | 1,437 |
| 4 | import-cost | 1,387 |
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