<div style="text-align:center"><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///ywAAAAAAQABAAACAUwAOw==" fifu-lazy="1" fifu-data-sizes="auto" fifu-data-srcset="https://i3.wp.com/www.awordpresscommenter.com/wp-content/uploads/2023/09/performance-chat-summary-19-september-2023-jpg.webp?ssl=1&w=75&resize=75&ssl=1 75w, https://i3.wp.com/www.awordpresscommenter.com/wp-content/uploads/2023/09/performance-chat-summary-19-september-2023-jpg.webp?ssl=1&w=100&resize=100&ssl=1 100w, https://i3.wp.com/www.awordpresscommenter.com/wp-content/uploads/2023/09/performance-chat-summary-19-september-2023-jpg.webp?ssl=1&w=150&resize=150&ssl=1 150w, https://i3.wp.com/www.awordpresscommenter.com/wp-content/uploads/2023/09/performance-chat-summary-19-september-2023-jpg.webp?ssl=1&w=240&resize=240&ssl=1 240w, https://i3.wp.com/www.awordpresscommenter.com/wp-content/uploads/2023/09/performance-chat-summary-19-september-2023-jpg.webp?ssl=1&w=320&resize=320&ssl=1 320w, https://i3.wp.com/www.awordpresscommenter.com/wp-content/uploads/2023/09/performance-chat-summary-19-september-2023-jpg.webp?ssl=1&w=500&resize=500&ssl=1 500w, https://i3.wp.com/www.awordpresscommenter.com/wp-content/uploads/2023/09/performance-chat-summary-19-september-2023-jpg.webp?ssl=1&w=640&resize=640&ssl=1 640w, https://i3.wp.com/www.awordpresscommenter.com/wp-content/uploads/2023/09/performance-chat-summary-19-september-2023-jpg.webp?ssl=1&w=800&resize=800&ssl=1 800w, https://i3.wp.com/www.awordpresscommenter.com/wp-content/uploads/2023/09/performance-chat-summary-19-september-2023-jpg.webp?ssl=1&w=1024&resize=1024&ssl=1 1024w, https://i3.wp.com/www.awordpresscommenter.com/wp-content/uploads/2023/09/performance-chat-summary-19-september-2023-jpg.webp?ssl=1&w=1280&resize=1280&ssl=1 1280w, https://i3.wp.com/www.awordpresscommenter.com/wp-content/uploads/2023/09/performance-chat-summary-19-september-2023-jpg.webp?ssl=1&w=1600&resize=1600&ssl=1 1600w" width="1280" height="720" fifu-data-src="https://i3.wp.com/www.awordpresscommenter.com/wp-content/uploads/2023/09/performance-chat-summary-19-september-2023-jpg.webp?ssl=1" class="attachment-post-thumbnail size-post-thumbnail wp-post-image" alt="Performance Chat Summary: 19 September 2023" title="Performance Chat Summary: 19 September 2023" srcset="https://i3.wp.com/www.awordpresscommenter.com/wp-content/uploads/2023/09/performance-chat-summary-19-september-2023-jpg.webp?ssl=1 1280w, https://www.awordpresscommenter.com/wp-content/uploads/2023/09/performance-chat-summary-19-september-2023-300x169.webp 300w, https://www.awordpresscommenter.com/wp-content/uploads/2023/09/performance-chat-summary-19-september-2023-1024x576.webp 1024w, https://www.awordpresscommenter.com/wp-content/uploads/2023/09/performance-chat-summary-19-september-2023-768x432.webp 768w" sizes="(max-width: 1280px) 100vw, 1280px" /></div><div>
<p><a href="https://make.wordpress.org/core/2023/09/19/performance-chat-agenda-19-september-2023/">Meeting agenda here</a> and the full chat log is available <a href="https://wordpress.slack.com/archives/C02KGN5K076/p1695135600316179">beginning here on Slack</a>.</p>
<h2 class="wp-block-heading">Announcements</h2>
<ul>
<li>Welcome to our new members of <a href="http://wordpress.slack.com/messages/core-performance/">#core-performance</a></li>
<li><a href="https://make.wordpress.org/core/2023/09/18/hallway-hangout-performance-improvements-for-wordpress-6-4/">Hallway Hangout: Performance Improvements for WordPress 6.4</a> is scheduled for <a href="https://www.timeanddate.com/worldclock/fixedtime.html?iso=20231019T1500"><abbr title="2023-10-19T15:00:00+00:00">Thursday, October 19, 2023 at 04:00 PM GMT+1</abbr></a></li>
<li>WordPress 6.4 beta 1 is September 27, 2023</li>
<li>Mention of the WordPress Performance Team in the <a href="https://www.searchenginejournal.com/september-2023-core-web-vitals-champ-wordpress-wix-duda-shopify/496058/#close">Search Engine Journal September 2023 article</a></li>
</ul>
<h2 class="wp-block-heading" id="focus-group-updates">Priority Projects</h2>
<h3 class="wp-block-heading" id="images">Server Response Time</h3>
<p><a href="https://make.wordpress.org/performance/roadmap-2023/#category-server-response-time">Link to roadmap projects</a></p>
<p>Contributors: <a href="https://profiles.wordpress.org/joemcgill/" class="mention"><span class="mentions-prefix">@</span>joemcgill</a> <a href="https://profiles.wordpress.org/spacedmonkey/" class="mention"><span class="mentions-prefix">@</span>spacedmonkey</a> <a href="https://profiles.wordpress.org/aristath/" class="mention"><span class="mentions-prefix">@</span>aristath</a> <a href="https://profiles.wordpress.org/swissspidy/" class="mention"><span class="mentions-prefix">@</span>swissspidy</a> <a href="https://profiles.wordpress.org/thekt12/" class="mention"><span class="mentions-prefix">@</span>thekt12</a> <a href="https://profiles.wordpress.org/mukesh27/" class="mention"><span class="mentions-prefix">@</span>mukesh27</a></p>
<ul>
<li><a href="https://profiles.wordpress.org/spacedmonkey/" class="mention"><span class="mentions-prefix">@</span>spacedmonkey</a>
<ul>
<li>Ready for review
<ul>
<li><a rel="noreferrer noopener" href="https://github.com/WordPress/wordpress-develop/pull/4460" target="_blank">https://github.com/WordPress/wordpress-develop/pull/4460</a></li>
<li><a href="https://core.trac.wordpress.org/ticket/58329">#58329</a></li>
</ul>
</li>
<li>Ready to commit
<ul>
<li><a href="https://core.trac.wordpress.org/ticket/58319">#58319</a></li>
</ul>
</li>
<li>Committed
<ul>
<li><a rel="noreferrer noopener" href="https://github.com/WordPress/wordpress-develop/commit/4ee594761f16e7aa9314fbf3088c3ad0c9ea3681" target="_blank">https://github.com/WordPress/wordpress-develop/commit/4ee594761f16e7aa9314fbf3088c3ad0c9ea3681</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="https://profiles.wordpress.org/mukesh27/" class="mention"><span class="mentions-prefix">@</span>mukesh27</a> I’ve been working on issue <a href="https://core.trac.wordpress.org/ticket/22192">#22192</a> and have received some feedback related to backward compatibility on <a rel="noreferrer noopener" href="https://github.com/WordPress/wordpress-develop/pull/5139#discussion_r1329015870" target="_blank">the PR</a>. I’m now in need of feedback from Joe and Felix</li>
<li><a href="https://profiles.wordpress.org/thekt12/" class="mention"><span class="mentions-prefix">@</span>thekt12</a> <a href="https://core.trac.wordpress.org/ticket/58319">#58319</a> completed (about to be committed)</li>
<li><a href="https://profiles.wordpress.org/thekt12/" class="mention"><span class="mentions-prefix">@</span>thekt12</a> <a href="https://core.trac.wordpress.org/ticket/58196">#58196</a> in progress, planning to give for initial review tomorrow</li>
<li><a href="https://profiles.wordpress.org/joemcgill/" class="mention"><span class="mentions-prefix">@</span>joemcgill</a> I made good progress on <a href="https://core.trac.wordpress.org/ticket/57789">#57789</a> yesterday and could use a second set of eyes. It doesn’t full solve the issue of making Theme.json data persistent, but is a step in that direction, which reduces unnecessary recalculation of that data during a page load. I’m going to work on a parallel PR to the Gutenberg repo to get some testing of the strategy in the plugin prior to making the change in core.</li>
</ul>
<h3 class="wp-block-heading" id="images">Database Optimization</h3>
<p><a href="https://make.wordpress.org/performance/roadmap-2023/#category-database-optimization">Link to roadmap projects</a></p>
<p>Contributors: <a href="https://profiles.wordpress.org/spacedmonkey/" class="mention"><span class="mentions-prefix">@</span>spacedmonkey</a> <a href="https://profiles.wordpress.org/mukesh27/" class="mention"><span class="mentions-prefix">@</span>mukesh27</a></p>
<ul>
<li><a href="https://profiles.wordpress.org/spacedmonkey/" class="mention"><span class="mentions-prefix">@</span>spacedmonkey</a>
<ul>
<li>Working on
<ul>
<li><a href="https://core.trac.wordpress.org/ticket/59188">#59188</a> <a rel="noreferrer noopener" data-hasqtip="158" href="https://github.com/WordPress/wordpress-develop/pull/4881" target="_blank">https://github.com/WordPress/wordpress-develop/pull/4881</a></li>
</ul>
</li>
<li>Needs review
<ul>
<li><a href="https://core.trac.wordpress.org/ticket/58599">#58599</a></li>
</ul>
</li>
</ul>
<ul>
<li>Committed
<ul>
<li><a rel="noreferrer noopener" href="https://github.com/WordPress/wordpress-develop/commit/640a53354cecf1f65098a311edc7c974037ff28b" target="_blank">https://github.com/WordPress/wordpress-develop/commit/640a53354cecf1f65098a311edc7c974037ff28b</a></li>
<li><a rel="noreferrer noopener" aria-describedby="qtip-128" href="https://github.com/WordPress/wordpress-develop/commit/4ba29eb1cbe7219e26adc08db8fab78593b054c7" target="_blank">https://github.com/WordPress/wordpress-develop/commit/4ba29eb1cbe7219e26adc08db8fab78593b054c7</a></li>
<li><a rel="noreferrer noopener" aria-describedby="qtip-130" href="https://github.com/WordPress/wordpress-develop/commit/0c7ddbd67a5ca8a2eacb0e034a08549fb190db28" target="_blank">https://github.com/WordPress/wordpress-develop/commit/0c7ddbd67a5ca8a2eacb0e034a08549fb190db28</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="https://profiles.wordpress.org/spacedmonkey/" class="mention"><span class="mentions-prefix">@</span>spacedmonkey</a> It is unclear of the path forward of <a href="https://core.trac.wordpress.org/ticket/59188">#59188</a> there seems to be disagreement on best path forward</li>
<li><a href="https://profiles.wordpress.org/mukesh27/" class="mention"><span class="mentions-prefix">@</span>mukesh27</a> The majority of the work from my end has already been committed for the 6.4 milestone. I am now providing support to Jonny for the review and testing process.</li>
</ul>
<h3 class="wp-block-heading" id="object-caching">JavaScript &#038; CSS</h3>
<p><a href="https://make.wordpress.org/performance/roadmap-2023/#category-javascript-css">Link to roadmap project</a></p>
<p>Contributors: <a href="https://profiles.wordpress.org/mukesh27/" class="mention"><span class="mentions-prefix">@</span>mukesh27</a> <a href="https://profiles.wordpress.org/10upsimon/" class="mention"><span class="mentions-prefix">@</span>10upsimon</a> <a href="https://profiles.wordpress.org/westonruter/" class="mention"><span class="mentions-prefix">@</span>westonruter</a> <a href="https://profiles.wordpress.org/spacedmonkey/" class="mention"><span class="mentions-prefix">@</span>spacedmonkey</a></p>
<ul>
<li><a href="https://profiles.wordpress.org/spacedmonkey/" class="mention"><span class="mentions-prefix">@</span>spacedmonkey</a> In need of review <a rel="noreferrer noopener" data-hasqtip="245" href="https://github.com/WordPress/wordpress-develop/pull/4824" target="_blank">https://github.com/WordPress/wordpress-develop/pull/4824</a></li>
<li><a href="https://profiles.wordpress.org/westonruter/" class="mention"><span class="mentions-prefix">@</span>westonruter</a> Similarly, I have the elimination of manual script tag construction scope reduced to not include the admin. Now it is just the frontend and the login screen. PR ready for review. <a rel="noreferrer noopener" href="https://github.com/WordPress/wordpress-develop/pull/4773" target="_blank">https://github.com/WordPress/wordpress-develop/pull/4773</a></li>
</ul>
<h3 class="wp-block-heading" id="measurement">Images</h3>
<p><a href="https://make.wordpress.org/performance/roadmap-2023/#category-images">Link to roadmap projects</a></p>
<p>Contributors: <a href="https://profiles.wordpress.org/flixos90/" class="mention"><span class="mentions-prefix">@</span>flixos90</a> <a href="https://profiles.wordpress.org/thekt12/" class="mention"><span class="mentions-prefix">@</span>thekt12</a> <a href="https://profiles.wordpress.org/joemcgill/" class="mention"><span class="mentions-prefix">@</span>joemcgill</a> <a href="https://profiles.wordpress.org/pereirinha/" class="mention"><span class="mentions-prefix">@</span>pereirinha</a> <a href="https://profiles.wordpress.org/spacedmonkey/" class="mention"><span class="mentions-prefix">@</span>spacedmonkey</a></p>
<ul>
<li><a href="https://profiles.wordpress.org/spacedmonkey/" class="mention"><span class="mentions-prefix">@</span>spacedmonkey</a> Committed <a href="https://core.trac.wordpress.org/ticket/58675">#58675</a></li>
<li><a href="https://profiles.wordpress.org/mukesh27/" class="mention"><span class="mentions-prefix">@</span>mukesh27</a> I worked on ticket <a href="https://core.trac.wordpress.org/ticket/58894">#58894</a> and it was committed yesterday</li>
<li><a href="https://profiles.wordpress.org/mukesh27/" class="mention"><span class="mentions-prefix">@</span>mukesh27</a> Currently, I’m providing support to <a href="https://profiles.wordpress.org/pereirinha/" class="mention"><span class="mentions-prefix">@</span>pereirinha</a> on ticket #58893</li>
<li><a href="https://profiles.wordpress.org/flixos90/" class="mention"><span class="mentions-prefix">@</span>flixos90</a> Committed <a href="https://core.trac.wordpress.org/changeset/56612">[56612]</a> and <a href="https://core.trac.wordpress.org/changeset/56613">[56613]</a> </li>
<li><a href="https://profiles.wordpress.org/flixos90/" class="mention"><span class="mentions-prefix">@</span>flixos90</a> Otherwise, reviewing the PRs for <a href="https://core.trac.wordpress.org/ticket/58892">#58892</a> and <a href="https://core.trac.wordpress.org/ticket/58893">#58893</a> which I see have received updates since, so I’ll take another look shortly after this chat</li>
<li><a href="https://profiles.wordpress.org/flixos90/" class="mention"><span class="mentions-prefix">@</span>flixos90</a> One thing I’d like to get another round of review on is <a href="https://core.trac.wordpress.org/ticket/58853">#58853</a> / <a rel="noreferrer noopener" aria-describedby="qtip-408" href="https://github.com/WordPress/wordpress-develop/pull/4973" target="_blank">https://github.com/WordPress/wordpress-develop/pull/4973</a></li>
<li><a href="https://profiles.wordpress.org/pereirinha/" class="mention"><span class="mentions-prefix">@</span>pereirinha</a> I’m currently waiting for feedback on <a href="https://core.trac.wordpress.org/ticket/58892">#58892</a> and <a href="https://core.trac.wordpress.org/ticket/58893">#58893</a> I’m happy to support anyone in the last mile</li>
</ul>
<h3 class="wp-block-heading" id="javascript">Measurement</h3>
<p><a href="https://make.wordpress.org/performance/roadmap-2023/#category-measurement">Link to roadmap projects</a></p>
<p>Contributors: <a href="https://profiles.wordpress.org/adamsilverstein/" class="mention"><span class="mentions-prefix">@</span>adamsilverstein</a> <a href="https://profiles.wordpress.org/joemcgill/" class="mention"><span class="mentions-prefix">@</span>joemcgill</a> <a href="https://profiles.wordpress.org/mukesh27/" class="mention"><span class="mentions-prefix">@</span>mukesh27</a> <a href="https://profiles.wordpress.org/swissspidy/" class="mention"><span class="mentions-prefix">@</span>swissspidy</a> <a href="https://profiles.wordpress.org/flixos90/" class="mention"><span class="mentions-prefix">@</span>flixos90</a></p>
<ul>
<li><a href="https://profiles.wordpress.org/flixos90/" class="mention"><span class="mentions-prefix">@</span>flixos90</a> Last week I spent some time conducting field analyses to assess the performance impact of the WordPress 6.3 release. Primarily focusing on Web Vitals metric LCP which measures load time performance, and how it’s affected both in general, but also specifically by the two major enhancements that were projected to affect LCP:
<ul>
<li>the emoji loader script optimizations</li>
<li>the lazy-loading plus fetchpriority improvements</li>
</ul>
</li>
<li>Sharing the most important highlights:
<ul>
<li>Overall, the Largest Contentful Paint (LCP) passing rate has improved by 5.6% for classic theme sites and by 2.7% for block theme sites </li>
<li>The Largest Contentful Paint (LCP) boost for classic theme sites using the emoji loader script is 3.4% to 7% higher than for those that <em>don’t</em> use it, and for block themes it’s 0.7% to 4.5% better as well </li>
<li>When looking at only the sites where that is the case and which were still lazy-loading the LCP image with WordPress 6.2, the LCP performance impact amounts to a massive 16% to 21% improvement for mobile viewports and 6% to 9% on desktop. </li>
<li>Lazy-loading accuracy has notably improved: In WordPress 6.3, only 9-10% of sites still lazy-load their LCP image for classic theme sites (down from 27-28% in 6.2) while for block theme sites it’s 5-8% (down from 17-29% in 6.2) </li>
</ul>
</li>
<li><a href="https://profiles.wordpress.org/flixos90/" class="mention"><span class="mentions-prefix">@</span>flixos90</a> drafted and published the <a href="https://make.wordpress.org/core/2023/09/19/analyzing-the-core-web-vitals-performance-impact-of-wordpress-6-3-in-the-field/">Analyzing the Core Web Vitals performance impact of WordPress 6.3 in the field</a> post</li>
<li><a href="https://profiles.wordpress.org/joemcgill/" class="mention"><span class="mentions-prefix">@</span>joemcgill</a> Nothing new from me this week, but we expect to do an initial round of benchmarks against WP 6.4 beta1 after it’s released next week.</li>
</ul>
<h3 class="wp-block-heading">Ecosystem Tools</h3>
<p><a href="https://make.wordpress.org/performance/roadmap-2023/#category-ecosystem-tools">Link to roadmap projects</a></p>
<p>Contributors: <a href="https://profiles.wordpress.org/mukesh27/" class="mention"><span class="mentions-prefix">@</span>mukesh27</a> <a href="https://profiles.wordpress.org/swissspidy/" class="mention"><span class="mentions-prefix">@</span>swissspidy</a> <a href="https://profiles.wordpress.org/westonruter/" class="mention"><span class="mentions-prefix">@</span>westonruter</a></p>
<ul>
<li>No updates this week</li>
</ul>
<h3 class="wp-block-heading" id="infrastructure">Creating Standalone Plugins</h3>
<p><a href="https://github.com/WordPress/performance/issues/656">Link to GitHub overview issue</a></p>
<p>Contributors: <a href="https://profiles.wordpress.org/flixos90/" class="mention"><span class="mentions-prefix">@</span>flixos90</a> <a href="https://profiles.wordpress.org/mukesh27/" class="mention"><span class="mentions-prefix">@</span>mukesh27</a> <a href="https://profiles.wordpress.org/10upsimon/" class="mention"><span class="mentions-prefix">@</span>10upsimon</a></p>
<ul>
<li>No updates this week</li>
</ul>
<h1 class="wp-block-heading">Open Floor</h1>
<ul>
<li><a href="https://profiles.wordpress.org/joemcgill/" class="mention"><span class="mentions-prefix">@</span>joemcgill</a> I wanted to mention that we should probably prepare some time after beta1 next week for some initial triage of any performance issues we see after the first round of code syncing from the Gutenberg project has occurred.</li>
<li><a href="https://profiles.wordpress.org/spacedmonkey/" class="mention"><span class="mentions-prefix">@</span>spacedmonkey</a> I would like to start a tracking ticket for dev notes this team is going to work on
<ul>
<li>Created https://github.com/WordPress/performance/issues/840 for tracking 6.4 Trac tickets that require dev notes</li>
</ul>
</li>
</ul>
<p><strong>Our next chat will be held on <a href="https://www.timeanddate.com/worldclock/fixedtime.html?iso=20230926T1500"><abbr class="date" title="2023-09-26T15:00:00+00:00">Tuesday, September 26, 2023 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 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/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>
</div>

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