WebPerformance Report
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WebPerformance Report
@webperfreport.bsky.social
Web page performance test report every week in your inbox. ⚡
Sponsored by: @Catchpoint | @DebugBear
👉 https://webperformancereport.com/
Pinned
⚡ We’ve made public the Perf Links dataset we update every week.
A simple, week-by-week collection of Web Performance resources.

All links from this year (including this week):
github.com/WebPerforman...

#webperf
github.com
Reposted by WebPerformance Report
Web Performance Calendar day 24 with @programmingart.bsky.social on TTFB. Yes, it's one of those X-mas Eves where we cuddle by the fire, drop everything and immerse into re-learning and re-evaluating what we thought we knew about a concept we use daily
calendar.perfplanet.com/2025/ttfb-do...
TTFB doesn't mean what you think it means
Time-To-First-Byte (TTFB) is a popular performance metric, yet there are many problems and nuances with it. Not only does it have several different definitions, it is usually also a "compound" metric,...
calendar.perfplanet.com
December 24, 2025 at 1:22 PM
⚡Featured posts this week:
✨ LCP and INP are now Baseline: @tunetheweb.com @mmocny.com
✨ Faster pages with Compression Dictionaries: @karlijnlowik.bsky.social
✨ A Short History of Perf Engineering: Alex Podelko
✨ Next.js Perf Optimization: Dany Paredes
🙏 Special thanks to the authors!
#webperf
December 21, 2025 at 1:27 PM
🎉 WebPerformance Report Week #51 is out! ✅
🔍 Ready for next Week? Don’t miss out!
⚡ Web Performance Report:👉 webperformancereport.com
🛡️ HTTP Security Report:👉 webperformancereport.com/httpo/
♿️ A11ty Report:👉 webperformancereport.com/wave/
#webperf #ux #seo #websecurity #accessibility #a11ty #ai
December 21, 2025 at 12:57 PM
⚡ We’ve made public the Perf Links dataset we update every week.
A simple, week-by-week collection of Web Performance resources.

All links from this year (including this week):
github.com/WebPerforman...

#webperf
github.com
December 20, 2025 at 2:52 PM
Reposted by WebPerformance Report
Web Performance Calendar day 17 with Adam Zachary Wasserman on outperforming modern frameworks with this one weird little trick

calendar.perfplanet.com/2025/the-old...
The Old Ways Are the Best: 100 Lighthouse, 0ms TBT, 32ms Queries
How mainframe-era techniques and native browser APIs outperform modern frameworks The Numbers Before the philosophy, the receipts: Frontend (multicardz.com): 32KB JavaScript bundle (15% of mini...
calendar.perfplanet.com
December 17, 2025 at 9:15 AM
Reposted by WebPerformance Report
Web Performance Calendar day 16 with @sandervs.bsky.social on why the word "millisecond" doesn't belong in the boardroom

calendar.perfplanet.com/2025/why-we-...
Why we should stop talking performance metrics to Business Leaders
Web performance is a lot like walking on those moving walkways at the airport. When it moves smoothly, you barely notice it. You feel fast. Supported. In control. But when one section stutters, even ...
calendar.perfplanet.com
December 16, 2025 at 1:52 PM
Reposted by WebPerformance Report
Web Performance Calendar day 15 with @nicj.net, @cliffcrocker.bsky.social and @karlijnlowik.bsky.social Löwik presenting an update on W3's RUM Community Group and YOU

calendar.perfplanet.com/2025/rumcg-a...
RUMCG - A year in review
performance.now() 2024 was the year we officially launched the W3 RUM Community Group. The idea to form a community group around real user monitoring (RUM) came from the desire to come together as ven...
calendar.perfplanet.com
December 15, 2025 at 9:57 AM
⚡Featured posts this week:
✨ Anatomy of a WebPerfReport: @webperfreport.bsky.social
✨ WebKit Features for Safari 26.2: @jensimmons.bsky.social
✨ How Monrif improved engagement by 8.9%: Fabrizio Guerra & Gianni Onnis
✨ How to load CSS (fast): @yoav.ws
🙏Special thanks to the authors!
#webperf
December 14, 2025 at 1:32 PM
🎉 WebPerformance Report Week #50 is out! ✅
🔍Ready for next Week? Don’t miss out!
⚡ Web Performance Report:👉 webperformancereport.com
🛡️ HTTP Security Report:👉 webperformancereport.com/httpo/
♿️ A11ty Report:👉 webperformancereport.com/wave/
#webperf #cybersecurity #websecurity #accessibility #A11ty #AI
December 14, 2025 at 1:09 PM
Reposted by WebPerformance Report
Safari 26.2 is here with 65 features + 165 bug fixes — including field-sizing, Navigation API, Largest Contentful Paint, command & commandfor, CHIPS opt-in partitioned cookies, scrollend event, random(), WebGPU in WebXR, scrollbar-color, hidden=until-found and much more! webkit.org/blog/17640/w...
WebKit Features for Safari 26.2
Safari 26.2 is a big release.
webkit.org
December 12, 2025 at 6:44 PM
Reposted by WebPerformance Report
Web Performance Calendar day 8 with Edwin Molina Hernández @webperfreport.bsky.social showing how a great perf report is more than numbers, it turns metrics into actionable answers to questions like "what improved?", "what regressed?", and "what to do next?".
calendar.perfplanet.com/2025/the-ana...
The Anatomy of a Web Performance Report
A high-level view of performance reporting In the performance community, we spend a lot of time talking about tools, metrics, budgets, thresholds, regressions, and dashboards. But at the end of the d...
calendar.perfplanet.com
December 8, 2025 at 11:35 AM
⚡Featured posts this week:
✨ Timeline of web features and browser support: @rviscomi.dev
✨ Fast by Default: @denodell.bsky.social
✨ Analyzing CSS Media Queries to Optimize Perf: @nucliweb.net
✨ What was new in web perf in 2025: @mattzeunert.com
🙏 Special thanks to the authors!
#webperf
December 7, 2025 at 11:01 AM
🎉 WebPerformance Report Week #49 is out!✅
🔍 Ready for next Week? Don’t miss out!
⚡ Web Performance Report:👉 webperformancereport.com
🛡️ HTTP Security Report:👉 webperformancereport.com/httpo/
♿️ A11ty Report:👉 webperformancereport.com/wave/
#webperf #cybersecurity #websecurity #accessibility #A11ty #AI
December 7, 2025 at 10:40 AM
🤩We just opened the Public Preview of our Reporting as a Service (RaaS) platform before the general release.
Users from different countries are already accessing their personal Boards.
Explore the platform by getting your own report: 👉 webperformancereport.com
#webperf
December 6, 2025 at 1:41 PM
⚡Featured posts this week:
✨ The Performance Inequality Gap, 2026: @infrequently.org
✨ How fast can browsers process base64 data?: @lemire.bsky.social
✨ Explaining the Accessible Benefits: @geoffgraham.me
✨ Why use React?: @adactio.com
🙏 Special thanks to the authors!
#webperf
November 30, 2025 at 1:34 PM
🎉 WebPerformance Report Week #48 is out! ✅
🔍 Ready for next Week? Don’t miss out!
⚡Web Performance Report:👉 webperformancereport.com
🛡️HTTP Security Report:👉 webperformancereport.com/httpo/
♿️A11ty Report:👉 webperformancereport.com/wave/
#webperf #cybersecurity #websecurity #accessibility #A11ty #AI
November 30, 2025 at 1:12 PM
Reposted by WebPerformance Report
🎥 ✨ SPDY STREAM 019 ✨
I'd like to give a big thank you to Edwin for joining the stream today to discuss the exciting vision behind @webperfreport.bsky.social . What began as a small initiative, expanded to delivering performance and user experience data to large organizations!
November 26, 2025 at 9:54 PM
Reposted by WebPerformance Report
Happy Friday! We quietly announced our next guest yesterday.
✨ SPDY STREAM 019 ✨ featuring Edwin M. Hernández 🇪🇨🇩🇪. The maintainer of the @webperfreport.bsky.social will join us to talk about his powerful & personalized perf report
📆 Wed November 26th
⏰ 1pm EST, 7pm CET
🔗 youtube.com/live/xEOLW_F...
November 21, 2025 at 9:50 PM
⚡Featured posts this week:
✨ WebPerf Report on SPDY STREAM: @henrihelvetica.bsky.social
✨ WordPress 6.9 Perf Landings: @weston.ruter.net
✨ I Built the Same App 10 Times: @cheddybop.bsky.social
✨ Start building with Gemini 3: @officiallogank.bsky.social
🙏 Special thanks to the authors!
#webperf
November 23, 2025 at 12:04 PM
🎉 WebPerformance Report Week #47 is out! ✅
🔍 Ready for next Week? Don’t miss out!
⚡ Web Performance Report: 👉 webperformancereport.com
🛡️ HTTP Security Report: 👉 webperformancereport.com/httpo/
♿️ A11ty Report: 👉 webperformancereport.com/wave/
#webperf #websecurity #accessibility #A11ty #AI
November 23, 2025 at 11:51 AM
⚡Featured posts this week:
✨ AI assistance for performance: @matthiasrohmer.bsky.social
✨ The Web Animation Performance: @citizenofnowhe.re
✨ How Fast Is Fast Enough?: @tammyeverts.com
✨ Performance is about people: @markzeman.com
🙏 Special thanks to the authors!
#webperf
November 16, 2025 at 2:15 PM
🎉 WebPerformance Report Week #46 is out! ✅
🔍 Ready for next Week? Don’t miss out!
⚡ Web Performance Report: 👉 webperformancereport.com
🛡️ HTTP Security Report: 👉 webperformancereport.com/httpo/
♿️ A11ty Report: 👉 webperformancereport.com/wave/
#webperf #websecurity #accessibility #A11ty #AI
November 16, 2025 at 1:59 PM
Testing @developer.chrome.com Side by Side view with two WebPerformance Report results.
A clean way to compare performance changes across deliveries.
Small SaaS preview. Coming soon…
⚡ WebPerformance Report
Get your own report: 👉 webperformancereport.com
#webperf
November 14, 2025 at 8:10 PM
⚡Featured posts this week:
@cloudflare.social TELESCOPE: @sergeyche.dev & @tkadlec.bsky.social
✨ Optimizing Webfonts: Lucas Dohmen
✨ How to optimize SVG files: @laurakalbag.bsky.social
✨ Using the Web Monetization API: @tomayac.com
🙏 Special thanks to the authors!
#webperf
November 9, 2025 at 1:18 PM
🎉 WebPerformance Report Week #45 is out! ✅
🔍 Ready for next Week? Don’t miss out!
⚡ Web Performance Report: 👉 webperformancereport.com
🛡️ HTTP Security Report: 👉 webperformancereport.com/httpo/
♿️ A11ty Report: 👉 webperformancereport.com/wave/
#webperf #websecurity #accessibility #A11ty #AI
November 9, 2025 at 12:05 PM