# Improved Speed Insights experience

**Published:** December 7, 2023 | **Authors:** Tobias Lins, Timo Lins, Damien Simonin Feugas, Chris Widmaier

---

Speed Insights measures site performance and helps you understand areas for improvement. This includes Core Web Vitals like [First Contentful Paint](https://vercel.com/docs/speed-insights#first-contentful-paint-fcp), [Largest Contentful Paint](https://vercel.com/docs/speed-insights#largest-contentful-paint-lcp), [Cumulative Layout Shift](https://vercel.com/docs/speed-insights#cumulative-layout-shift-cls), and more.

The Speed Insights experience has been improved to include:

- **Support for all frontend frameworks:** You can now use Speed Insights with any framework using the new `@vercel/speed-insights` package. This includes supporting dynamic route segments in frameworks like SvelteKit and Remix.
- **First-party data ingestion**: Data will now be processed directly through your own domain, eliminating the third-party domain lookup.
- **Updated scoring criteria:** All previous and future metrics measured by Speed Insights are now updated with new weights, based on the latest guidance from Core Web Vitals and Lighthouse.
- **UI improvements:** You can now view performance data by region. Displayed metrics now default to p75 (the experience of the fastest 75% of your users).
- **Time to First Byte (TTFB):** This metric is now measured, providing visibility into how quickly the server responds to the first request.
- **Advanced customization**: New tools to [intercept requests](https://vercel.com/docs/speed-insights/package#beforesend) and [set sample rates](https://vercel.com/docs/speed-insights/package#samplerate) on a per-project basis.

Speed Insights is [available on all plans](https://vercel.com/docs/speed-insights). Learn more about [upgrading to the new package ](https://vercel.com/docs/speed-insights/migrating-from-legacy)and see how to take advantage of the new features.

---

📚 **More updates:** [View all changelog entries](/changelog/sitemap.md) | [Blog](/blog/sitemap.md)