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#webperf

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Sia Karamalegos<p>June web performance data is now live on Theme Vitals - and we see the first data for Horizon rolling in. Spoiler alert: it’s pretty bad.<br><a href="https://front-end.social/tags/Shopify" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Shopify</span></a> <a href="https://front-end.social/tags/webperf" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>webperf</span></a></p><p><a href="https://themevitals.com/newsletter/2025-07/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">themevitals.com/newsletter/202</span><span class="invisible">5-07/</span></a></p>
Timo Tijhofanswer
Nathan Knowler<p>In custom elements, is it best to create one MutationObserver that handles every instance of the custom element or observers per instance, then set up and tear down the observer inside the custom element lifecycle? The target would be the custom element itself (or something within its shadow tree). <a href="https://sunny.garden/tags/WebComponents" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>WebComponents</span></a> <a href="https://sunny.garden/tags/WebPerf" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>WebPerf</span></a></p>
Jason Cosper<p><span class="h-card" translate="no"><a href="https://mastodon.social/@belldotbz" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>belldotbz</span></a></span> Thanks for doing this!</p><p>Anyone need a hand with a slow or broken <a href="https://simian.rodeo/tags/WordPress" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>WordPress</span></a> site?</p><p>I'm Jason, a freelance WP dev with 20+ years of experience. I specialize in performance tuning, security, and custom plugin development. I help site owners save time by making their websites work for them, not against them.</p><p>My consultancy is Little Room. Check it out!</p><p><a href="https://littleroom.studio" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="">littleroom.studio</span><span class="invisible"></span></a></p><p><a href="https://simian.rodeo/tags/GetFediHired" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>GetFediHired</span></a> <a href="https://simian.rodeo/tags/FediHire" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>FediHire</span></a> <a href="https://simian.rodeo/tags/WebPerf" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>WebPerf</span></a></p>
James Royal-Lawson<p>Anyone with knowledge of css efficiency - what is the impact of doing say:<br> a[href^="http"]:not([href*="example.com"])::after </p><p>compared to:</p><p>.external-link::after </p><p>or even :</p><p>a.external-link::after?</p><p><a href="https://mastodon.social/tags/css" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>css</span></a> <a href="https://mastodon.social/tags/webperf" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>webperf</span></a></p>
Inautilo<p><a href="https://mastodon.social/tags/Development" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Development</span></a> <br>SVG optimization and accessibility basics · Techniques to make your SVGs lightweight and accessible <a href="https://ilo.im/164xg5" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="">ilo.im/164xg5</span><span class="invisible"></span></a></p><p>_____<br><a href="https://mastodon.social/tags/SVG" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>SVG</span></a> <a href="https://mastodon.social/tags/SVGO" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>SVGO</span></a> <a href="https://mastodon.social/tags/Optimization" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Optimization</span></a> <a href="https://mastodon.social/tags/Accessibility" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Accessibility</span></a> <a href="https://mastodon.social/tags/WebPerf" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>WebPerf</span></a> <a href="https://mastodon.social/tags/WebDev" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>WebDev</span></a> <a href="https://mastodon.social/tags/Frontend" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Frontend</span></a> <a href="https://mastodon.social/tags/HTML" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>HTML</span></a> <a href="https://mastodon.social/tags/ARIA" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ARIA</span></a></p>
Tammy Everts<p>So much great stuff in this huge performance budgets upgrade!</p><p>👍 Centralized budget management<br>👍 Easier navigation and filtering<br>👍 Budget names and descriptions<br>👍 Alert history<br>👍 Full audit trail for each budget<br>👍 And more!</p><p><a href="https://www.speedcurve.com/blog/performance-budgets-major-update/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">speedcurve.com/blog/performanc</span><span class="invisible">e-budgets-major-update/</span></a></p><p><a href="https://webperf.social/tags/webperf" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>webperf</span></a> <a href="https://webperf.social/tags/ux" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ux</span></a> <a href="https://webperf.social/tags/sitespeed" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>sitespeed</span></a> <a href="https://webperf.social/tags/pagespeed" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>pagespeed</span></a></p>
NY UX Speed & Web Performance<p>Video <a href="https://www.youtube.com/watch?v=6ros6iNSdVU&amp;list=UU_DH6Z_K_3JRgOdDnwHLrLw" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">youtube.com/watch?v=6ros6iNSdV</span><span class="invisible">U&amp;list=UU_DH6Z_K_3JRgOdDnwHLrLw</span></a> from Akshay Nair's "Performance on a Budget: Lessons from Building a Nonprofit SaaS Platform" talk.</p><p>To get notified when next video is up, subscribe and hit the bell button <a href="https://webperf.social/tags/webperf" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>webperf</span></a> <a href="https://webperf.social/tags/nyc" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>nyc</span></a></p>
WebPerformance Report<p>Hey guys, we’re ready for Sunday.<br>We checked the WebPerformance of Red Hat’s website before Sunday’s delivery. Everything looks good!<br>Take a look at the report:<br>👉 <a href="https://webperformancereport.com/report/wpt/250620_ZiDcRA_7RQ?utm_source=webperfreport&amp;utm_medium=mastodon" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">webperformancereport.com/repor</span><span class="invisible">t/wpt/250620_ZiDcRA_7RQ?utm_source=webperfreport&amp;utm_medium=mastodon</span></a><br><a href="https://webperf.social/tags/webperf" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>webperf</span></a> <a href="https://webperf.social/tags/crux" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>crux</span></a> <a href="https://webperf.social/tags/corewebvitals" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>corewebvitals</span></a> <a href="https://webperf.social/tags/ux" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ux</span></a> <a href="https://webperf.social/tags/seo" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>seo</span></a> <a href="https://webperf.social/tags/redhat" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>redhat</span></a> <a href="https://webperf.social/tags/tech" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>tech</span></a></p>

We ❤️ great people building apps that empower other folks to use our tools! The new open‑source #Magento module – from @jesperingels and the team at Bluebird Day – lets you integrate our real user monitoring into your Magento project in minutes – no coding required!

Discover the benefits of gathering real user data, plus how to get started: speedcurve.com/blog/real-user-

SpeedCurveSpeedCurve | NEW! SpeedCurve RUM for your Magento projectsIntegrate robust real user monitoring into your Magento project in minutes!
#webperf#ux#corewebvitals

In a little over 24 hours I'll be presenting an introduction to diving into the web performance data in the Chrome User Experience Report (CrUX) and HTTP Archive related to how I built Theme Vitals. Come join us!

#webperf

performanceobserver.dev/

PerformanceObserver: A virtual web perf meetupPerformanceObserver: A virtual web perf meetupJoin the PerformanceObserver virtual performance meetup to get all the latest web performance news and hang out with the community.

I was excited when @speedcurve.com reached out to me to build their #Shopify app - now it's easier to integrate full real-user performance data collection in Shopify storefronts and correlate that data with bounce rates and conversions.

Now you can see exactly how #webperf impacts your bottom line!

Developing the twom database for Cyrus IMAP,
by Bron Gondwana at Fastmail (@fastmail).

"""
TIL: fcntl isn’t fair. Releasing the lock didn’t magically let a waiting writer proceed, the same process would often pick up the lock again without giving another process a chance. On busy files, writers could entirely starve.
"""

fastmail.com/blog/introducing-

Fastmail · Introducing the twom database formatWe replaced the twoskip database format with something faster and better.