@WPOtips

Useful information about Web Performance Optimisation and tips how to speed up your websites. #webperf #sitespeed // tweets by @kamilhavlicek

Joined May 2020
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20Media
Learn how @QuintoAndar boosted conversions by 36% with an 80% INP reduction → goo.gle/3DmTGPN Prioritizing web performance with "Code Yellow," optimizing long tasks, and implementing robust governance delivered a significantly better UX!
How QuintoAndar reduced INP by 80%, increasing conversions by 36%

ALT How QuintoAndar reduced INP by 80%, increasing conversions by 36%

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Very interesting article for everyone struggling with cookie banners impacting their #CoreWebVitals: xitter.cf/DebugBear/status/19027…
DebugBear
@DebugBear20 Mar 2025
Cookie banners can cause web performance and Core Web Vitals issues. Check out this new article to learn about different problems and what you can do about them. debugbear.com/blog/cookie-co…

Cookie Consent Banners, Page Speed, And Core Web Vitals | DebugBear

Cookie banners can impact the Core Web Vitals of your website in different ways. Learn how and what you can do about it.

debugbear.com
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🔖 Blogpost Tip: Bringing site speed metrics back to GA4 (by @thyng) #googleanalytics #ga4 #webperf
David Vallejo@thyng14 Jul 2022
New blog post: Performance Timing tracking on Google Analytics 4 ( Legacy Site Speed Reporting on Universal ) thyngster.com/performance-ti…
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💡#Webperf TIP: Don't forget to make sure that common marketing parameters are included in your caching rules (fbclid, gclid, msclkid, utm_ parameters, etc.) Otherwise the website might load significantly slower for users coming through your marketing campaigns! #webperformance
RUMvision - Page speed monitoring@suxbyrumvision4 Jul 2022
This company had Facebook #ads running... but someone forgot to add fbclid to the #caching rules, ouch. 😬 Luckily we've spotted this right away with some #realusermonitoring
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📗 Some nice reading for the weekend: A new article from @gtmetrix about Slow TTFB issue and who to talk to about it - Developer or the Hosting Provider? gtmetrix.com/blog/slow-ttfb-… #webperf

Slow TTFB: Hosting or Developer? - GTmetrix

In the first of our Hosting or Developer? series, we dissect the causes of a slow TTFB for your site.

gtmetrix.com
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What do you imagine when you see the job title "Web Performance Manager"? A marketing job role, or rather something #webperf-related?
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💡#WebPerformance Tip! Scrollbars can cause unwanted layout shifts and influence the CLS metric. You can fix that using the `scrollbar-gutter:stable` CSS property: developer.mozilla.org/en-US/… #cls #webperf #pagespeed

scrollbar-gutter CSS property - CSS | MDN

The scrollbar-gutter CSS property allows authors to reserve space for the scrollbar, preventing unwanted layout changes as the content grows while also avoiding unnecessary visuals when scrolling...

developer.mozilla.org
Tim Vereecke@TimVereecke9 May 2022
After implementing "scrollbar-gutter:stable" the amount of page-views with a layout shift dropped nicely! #AimForZero #CLS #WebPerf
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📺 #WebPerf Video Recommendation for Sunday afternoon: Maciek Palmowski (@palmiak_fp) made a very interesting interview with @HenriHelvetica about web performance and next steps in the web evolution. Including Q&A section at the end... youtube.com/watch?v=SL6wdcLo…
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💡#Webperf tip: Decrease the file size and complexity of your SVG files. SVG Files (especially when exported from graphic editors) contain a lot of unnecessary metadata and elements that are not needed. You can use a tool called SVGOMG to minify them: github.com/jakearchibald/svg…

GitHub - jakearchibald/svgomg: Web GUI for SVGO

Web GUI for SVGO. Contribute to jakearchibald/svgomg development by creating an account on GitHub.

github.com
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Or if you prefer to work with CLI - you can use directly the SVGO tool: github.com/svg/svgo

GitHub - svg/svgo: SVG Optimizer for Node.js and CLI. ⚙️

SVG Optimizer for Node.js and CLI. ⚙️. Contribute to svg/svgo development by creating an account on GitHub.

github.com
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WebPerf / WPO Tips retweeted
Dan Shappir@DanShappir13 Apr 2022
Are you interested in #webperf and #CWV ? We've had several episodes on @JSJabber podcast discussing what they are, how they're measured, and how they impact #UX and #SEO. Here are the most relevant ones: 🧵➡️
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🔧 Great news! A new Performance Insights panel! #webperf
Chrome DevTools@ChromeDevTools1 Apr 2022
⚠️ Spoiler alert! A new Performance Insights panel is coming in Chrome Canary. 👀 It's experimental, so... give it a try and share with us your thoughts! goo.gle/devtools-performance
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💡A great #webperf tip from @Steve8708:
Steve (Builder.io)
@Steve870821 Mar 2022
Performance tip: make your page load feel more instant by using priority hints to help the browser prioritize the most critical resources More you can do with priority hints in 🧵:
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WebPerf / WPO Tips retweeted
Simon Hearne@simonhearne2 Mar 2022
Today's #WebPerf pro tip: don't lazy load LCP images! This one crept in on one of my client's sites, discovered because LCP started creeping up on a key template.
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📗 Great #webperf book tips:
Joan León 🏞️⚡️@nucliweb1 Mar 2022
Books that have helped and continue to help me understand Web Performance 📚 #WebPerf #Performance #WPO #ImagePerf #PerfCrafters 🧵
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FYI: Core Web Vitals for error pages are not counted in the Chrome UX Report (CrUX):
Annie Sullivan (@anniesullie.bsky.sociall)@anniesullie26 Jan 2022
Replying to @blue2blond @KamilHavlicek @ChromeUXReport @philwalton
404 and other error pages are not counted. Here's the documentation on the code that does the filtering: chromium.googlesource.com/ch…
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Let's start a thread with #webperf related job opportunities:
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xitter.cf/Catchpoint/status/1487…
Catchpoint@Catchpoint28 Jan 2022
Join the journey with us and @RealWebPageTest to see where we're headed next in #observability and #webperf. We're hiring 👉 bit.ly/3xEDkJi #Catchpointer #CatchpointCrew #monitoring #hiring #career #winningteam
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Does anyone know?
Kamil Havlicek@KamilHavlicek22 Jan 2022
Question about @ChromeUXReport: Are visits of 404 error pages included in the CWV metrics? For example, what if the 404 error page has an incredibly huge layout shift - will this be counted in the CLS metric? #WebPerformance #PageSpeedInsights
💡#Webperf tip/reminder: Monitor closely all the changes published in your Google Tag Manager and their influence on the web performance:
Colin Bendell@colinbendell7 Dec 2021
A Shopify merchant was struggling to explain why their daily lighthouse speed scores dropped 5 days ago, despite: • NO code changes • NO new apps Can you spot when the marketing team made changes with Google Tag Manager? Lesson: Marketing ships code changes too!
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