---
title: Resource Timing
slug: Glossary/Resource_Timing
tags:
  - Glossary
  - Timings
  - Web Performance
---
Diagnosing performance issues requires performance data at the granularity of the resource. The [Resource Timing API](/en-US/docs/Web/API/Resource_Timing_API) is a JavaScript API that is able to capture timing information for each individual resource that is fetched when a page is loaded.

## See also

- [Using the resource timing API](/en-US/docs/Web/API/Resource_Timing_API/Using_the_Resource_Timing_API)
- [Server Timing](https://www.w3.org/TR/server-timing/)
