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<p>The full chat log is available beginning <a href="https://wordpress.slack.com/archives/C02KGN5K076/p1758639623777019">here on Slack</a>.</p>
<h2 class="wp-block-heading"><strong>WordPress Performance Trac tickets</strong></h2>
<ul class="wp-block-list">
<li><a href="https://profiles.wordpress.org/westonruter/" class="mention"><span class="mentions-prefix">@</span>westonruter</a> shared that PR <a href="https://github.com/WordPress/wordpress-develop/pull/8412">#8412</a> has tests added and is ready for review, though he still needs to update the description and remove the draft status.</li>
<li><a href="https://profiles.wordpress.org/westonruter/" class="mention"><span class="mentions-prefix">@</span>westonruter</a> enquired about PR <a href="https://github.com/WordPress/wordpress-develop/pull/9867">#9867</a>, which enables printing script modules in the footer.
<ul class="wp-block-list">
<li><a href="https://profiles.wordpress.org/b1ink0/" class="mention"><span class="mentions-prefix">@</span>b1ink0</a> added that work is currently underway to implement sorting behavior for script modules and their dependencies.</li>
</ul>
</li>
<li><a href="https://profiles.wordpress.org/westonruter/" class="mention"><span class="mentions-prefix">@</span>westonruter</a> enquired about core milestone <a href="https://core.trac.wordpress.org/ticket/63012">#63012</a> regarding theme CSS minification.
<ul class="wp-block-list">
<li><a href="https://profiles.wordpress.org/b1ink0/" class="mention"><span class="mentions-prefix">@</span>b1ink0</a> mentioned having a <a href="https://github.com/b1ink0/wordpress-develop/commit/e520cff2d797df53a109d3be933087a009d83684" data-type="link" data-id="https://github.com/b1ink0/wordpress-develop/commit/e520cff2d797df53a109d3be933087a009d83684">POC</a> (minification only for block themes) to partially address <a href="https://core.trac.wordpress.org/ticket/63012">#63012</a> and is working with <a href="https://profiles.wordpress.org/shyamgadde/" class="mention"><span class="mentions-prefix">@</span>shyamgadde</a> on a POC addressing the remaining points, with plans to raise PRs in the coming week.</li>
</ul>
</li>
<li><a href="https://profiles.wordpress.org/westonruter/" class="mention"><span class="mentions-prefix">@</span>westonruter</a> mentioned PR <a href="https://github.com/WordPress/wordpress-develop/pull/9770" data-type="link" data-id="https://github.com/WordPress/wordpress-develop/pull/9770">#9770</a> to iterate on <code>fetchpriority</code> for script modules, to allow enqueued script modules to influence the priority of dependencies (or vice versa, which is not yet totally clear).</li>
</ul>
<h2 class="wp-block-heading"><strong>Performance Lab Plugin (and other performance plugins)</strong></h2>
<ul class="wp-block-list">
<li><a href="https://profiles.wordpress.org/westonruter/" class="mention"><span class="mentions-prefix">@</span>westonruter</a> shared that PR <a href="https://github.com/WordPress/performance/pull/2159">#2159</a> is ready for review with a verified fix.</li>
</ul>
<h2 class="wp-block-heading"><strong>Open Floor</strong></h2>
<ul class="wp-block-list">
<li><a href="https://profiles.wordpress.org/westonruter/" class="mention"><span class="mentions-prefix">@</span>westonruter</a> shared that there may be a blocker preventing ticket <a href="https://core.trac.wordpress.org/ticket/63636">#63636</a> from being a good candidate for WordPress 6.9. The issue relates to a bug in Chrome where sending the <code>Clear-Site-Data</code> header such as during logout can slow down page performance. While this approach is preferable to using <code>pageshow</code> to invalidate the bfcache, the Chrome bug may require postponing the feature to 7.0.</li>
<li><a href="https://profiles.wordpress.org/khoipro/" class="mention"><span class="mentions-prefix">@</span>khoipro</a> suggested adding a filter to exclude certain taxonomies from slow term-count queries in large projects.
<ul class="wp-block-list">
<li><a href="https://profiles.wordpress.org/johnbillion/" class="mention"><span class="mentions-prefix">@</span>johnbillion</a> noted that while the suggestion didn’t seem directly related, two recent fixes in WordPress 6.9 have already reduced unnecessary term recounting <a href="https://core.trac.wordpress.org/ticket/42522">#42522</a> and <a href="https://core.trac.wordpress.org/ticket/63562">#63562</a>.</li>
</ul>
</li>
</ul>
<p><strong>Our next chat will be held on <a href="https://www.timeanddate.com/worldclock/fixedtime.html?iso=20251007T1500"><abbr class="date" title="2025-10-07T15:00:00+00:00">Tuesday, October 7, 2025 at 15:00 UTC</abbr></a> in the <a href="https://wordpress.slack.com/messages/core-performance/">#core-performance channel</a> in <a href="https://make.wordpress.org/chat/">Slack</a></strong>.</p>
</p>
<p class="o2-appended-tags"><a href="https://make.wordpress.org/core/tag/core-performance/" class="tag"><span class="tag-prefix">#</span>core-performance</a>, <a href="https://make.wordpress.org/core/tag/hosting/" class="tag"><span class="tag-prefix">#</span>hosting</a>, <a href="https://make.wordpress.org/core/tag/performance/" class="tag"><span class="tag-prefix">#</span>performance</a>, <a href="https://make.wordpress.org/core/tag/performance-chat/" class="tag"><span class="tag-prefix">#</span>performance-chat</a>, <a href="https://make.wordpress.org/core/tag/summary/" class="tag"><span class="tag-prefix">#</span>summary</a></p>
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