Aditya Dhade 5:53 pm on December 16, 2025
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Performance Chat Summary: 16 December 2025

The full chat log is available beginning here on Slack.

WordPress Performance TracTrac An open source project by Edgewall Software that serves as a bug tracker and project management tool for WordPress. tickets

  • @westonruter shared that he is still working through fixes for a CSSCSS Cascading Style Sheets. issue introduced in WordPress 6.9 related to loading separate blockBlock Block is the abstract term used to describe units of markup that, composed together, form the content or layout of a webpage using the WordPress editor. The idea combines concepts of what in the past may have achieved with shortcodes, custom HTML, and embed discovery into a single consistent API and user experience. styles on demand in PR #10601.

Performance Lab PluginPlugin A plugin is a piece of software containing a group of functions that can be added to a WordPress website. They can extend functionality or add new features to your WordPress websites. WordPress plugins are written in the PHP programming language and integrate seamlessly with WordPress. These can be free in the WordPress.org Plugin Directory https://wordpress.org/plugins/ or can be cost-based plugin from a third-party (and other performance plugins)

  • @westonruter noted that several PRs needs to be reviewed.
  • @b1ink0 asked for feedback regarding the planned sunsetting of the Web Worker Offloading plugin issue #2284.

Open Floor

  • @westonruter shared that Safari now supports measuring the LCP metric, which he said will meaningfully improve URLURL A specific web address of a website or web page on the Internet, such as a website’s URL www.wordpress.org Metric collection for Optimization Detective
    • @spacedmonkey wondered whether the team could begin running the performance coreCore Core is the set of software required to run WordPress. The Core Development Team builds WordPress. e2e tests against Safari now that the browser includes this capabilitycapability A capability is permission to perform one or more types of task. Checking if a user has a capability is performed by the current_user_can function. Each user of a WordPress site might have some permissions but not others, depending on their role. For example, users who have the Author role usually have permission to edit their own posts (the “edit_posts” capability), but not permission to edit other users’ posts (the “edit_others_posts” capability)..
  • @westonruter added that he is interested in exploring Compression Dictionaries after learning they can be implemented in PHPPHP The web scripting language in which WordPress is primarily architected. WordPress requires PHP 7.4 or higher with relatively little effort referenced article.
  • @b1ink0 shared information regarding the final 2025 meeting to discuss the 2026 roadmap, scheduled for December 23, 2025.

Our next chat will be held on Tuesday, December 30, 2025 at 16:00 UTC in the #core-performance channel in Slack.

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