The  Web Performance Working Group  invites implementations of a new Candidate Recommendation of  Resource Timing . This specification defines interfaces for web applications to access the complete timing information for resources in a document, as user latency is an important quality benchmark for Web Applications.

The  Web Performance Working Group  published the  Preload  specification as a Discontinued Draft. The content is now integrated in the  HTML living standard . Publication as a Discontinued Draft implies that this document is no longer intended to advance or to be maintained. It is inappropriate to cite this document as other than abandoned work.

23 July 2019 The  Web Performance Working Group  has published a First Public Working Draft of  Timing Entry Names Registry . This document provides a registry of  PerformanceEntry.entryType  used in Performance Timeline [ PERFORMANCE-TIMELINE-2 ].

The Web Performance Working Group has published User Timing Level 2 as a W3C Recommendation. This specification defines an interface to help web developers measure the performance of their applications by giving them access to high precision timestamps. User Timing Level 2 is intended to supersede the first version of User Timing specification.

9 July 2018 The  Web Performance Working Group  invites implementations of  User Timing Level 2  Candidate Recommendation. This specification defines an interface to help web developers measure the performance of their applications by giving them access to high precision timestamps.

The  Web Performance Working Group  invites implementations of an updated Candidate Recommendation of  High Resolution Time Level 2 . This specification defines an API that provides the time origin, and current time in sub-millisecond resolution, such that it is not subject to system clock skew or adjustments.

26 October 2017 The  Web Performance Working Group  invites implementations of the  Preload  Candidate Recommendation. This specification defines the  preload keyword that may be used with  link  elements. This keyword provides a declarative fetch primitive that initiates an early fetch and separates fetching from resource execution.

8 December 2016 The  Web Performance Working Group  invites implementation of the Candidate Recommendation of  Performance Timeline Level 2 . This specification extends the High Resolution Time specification by providing methods to store and retrieve high resolution performance metric data. Accurately measuring performance characteristics of web applications is an important aspect of making web applications faster. This specification defines the necessary Performance Timeline primitives that enable web developers to access, instrument, and retrieve various performance metrics from the full lifecycle of a web application.

24 June 2014 The Web Performance Working Group has published a Last Call Working Draft of Beacon . This specification defines an interoperable means for site developers to asynchronously transfer small HTTP data from the User Agent to a web server. Comments are welcome through 29 July 2014 . The Web Performance Working Group also updated the Candidate Recommendation of Resource Timing . This specification defines an interface for web applications to access the complete timing information for resources in a document. Learn more about the Rich Web Client Activity .

31 January 2013 The Web Performance Working Group has published the First Public Working Draft of Navigation Timing 2 . This specification defines a unified interface to store and retrieve high resolution performance metric data related to the navigation of a document. Learn more about the Rich Web Client Activity .

28 September 2012 W3C announced a Workshop on Web Performance , 8 November, hosted by Google at their Mountain View, California campus. As the Open Web Platform expands, the need for high performance implementation has grown, particularly on mobile devices. Participants will examine a broad range of performance issues and how they might be addressed. There is no fee to participate in this Workshop and W3C Membership is not required. All participants are required to submit a statement of interest by 29 October. Learn more about W3C's Web Performance Working Group , which also invites people to share performance issues via their survey on Open Web Platform Performance Priorities .

26 July 2012 The Web Performance Working Group invites implementation of three Candidate Recommendations: Page Visibility which defines a means for site developers to programmatically determine the current visibility state of the page in order to develop power and CPU efficient web applications. Performance Timeline which defines an unified interface to store and retrieve performance metric data. This specification does not cover individual performance metric interfaces. User Timing which defines an interface to help web developers measure the performance of their applications by giving them access to high precision timestamps. Learn more about the Rich Web Client Activity .