Andrea Verlicchi
@verlok.bsky.social
I love to create and optimize websites. I'm passionate about web performance, accessibility and user experience. I write about the web on my tech blog, on Medium and Smashing Magazine, and I love to speak at web conferences.
Last Wednesday I had the pleasure of speaking at the performance.sync() organized by @mozilla.org in Amsterdam.
My talk was a 15-minute session where I shared practical techniques for debugging and optimizing slow interactions on websites.
Post and slides: www.andreaverlicchi.eu/blog/improvi...
My talk was a 15-minute session where I shared practical techniques for debugging and optimizing slow interactions on websites.
Post and slides: www.andreaverlicchi.eu/blog/improvi...
November 1, 2025 at 1:15 PM
Last Wednesday I had the pleasure of speaking at the performance.sync() organized by @mozilla.org in Amsterdam.
My talk was a 15-minute session where I shared practical techniques for debugging and optimizing slow interactions on websites.
Post and slides: www.andreaverlicchi.eu/blog/improvi...
My talk was a 15-minute session where I shared practical techniques for debugging and optimizing slow interactions on websites.
Post and slides: www.andreaverlicchi.eu/blog/improvi...
#perfnow This is so cool @rich-harris.dev! Svelte looks much easier and better to use then React. My question is quite simple: why did React get so much traction and adoption, instead?
October 31, 2025 at 4:48 PM
#perfnow This is so cool @rich-harris.dev! Svelte looks much easier and better to use then React. My question is quite simple: why did React get so much traction and adoption, instead?
It’s an honor to see my company #speedkit mentioned on stage at #perfnow by a web performance VIP and ambassador such as Barry @tunetheweb.com Pollard. 😊 Congrats to the Speed Kit team who implemented speculation rules in such an effective way in our product!
October 31, 2025 at 3:20 PM
It’s an honor to see my company #speedkit mentioned on stage at #perfnow by a web performance VIP and ambassador such as Barry @tunetheweb.com Pollard. 😊 Congrats to the Speed Kit team who implemented speculation rules in such an effective way in our product!
Yay! We will soon be able to measure whether soft navigations are faster or slower than hard navigations (with speculation rules maybe) #perfnow @mmocny.com
October 31, 2025 at 11:15 AM
Yay! We will soon be able to measure whether soft navigations are faster or slower than hard navigations (with speculation rules maybe) #perfnow @mmocny.com
If someone at #perfnow organization can read this, maybe @ppkoch.bsky.social, is there a way to stop the big screen to flicker? I hope it is just an issue with Michael's computer
October 31, 2025 at 10:46 AM
If someone at #perfnow organization can read this, maybe @ppkoch.bsky.social, is there a way to stop the big screen to flicker? I hope it is just an issue with Michael's computer
#perfnow I think Safari Tech Preview just updated and now it support INP. cc @tkadlec.bsky.social
October 31, 2025 at 10:37 AM
#perfnow I think Safari Tech Preview just updated and now it support INP. cc @tkadlec.bsky.social
The domain loaf.cafe is available and quite cheap if you want to something with it @andydavies.me #perfnow
October 31, 2025 at 9:50 AM
The domain loaf.cafe is available and quite cheap if you want to something with it @andydavies.me #perfnow
#perfnow q for @andydavies.me:
When doing a web perf audit, what is your favourite way to get to the longest function source code, given the script URL and the character position of the function?
I only found a VS Code extension to do so, but I'm curious do what's yours.
When doing a web perf audit, what is your favourite way to get to the longest function source code, given the script URL and the character position of the function?
I only found a VS Code extension to do so, but I'm curious do what's yours.
October 31, 2025 at 9:37 AM
#perfnow q for @andydavies.me:
When doing a web perf audit, what is your favourite way to get to the longest function source code, given the script URL and the character position of the function?
I only found a VS Code extension to do so, but I'm curious do what's yours.
When doing a web perf audit, what is your favourite way to get to the longest function source code, given the script URL and the character position of the function?
I only found a VS Code extension to do so, but I'm curious do what's yours.
Reposted by Andrea Verlicchi
"But Andrea, the synchronous tracking code is secretly hidden deep within Google Tag Manager!"
@verlok.bsky.social is calling me out, and I'm not sure I like it. 😅 But some great tips on common INP mistakes.
#PerfNow #webperf
@verlok.bsky.social is calling me out, and I'm not sure I like it. 😅 But some great tips on common INP mistakes.
#PerfNow #webperf
October 29, 2025 at 8:00 PM
"But Andrea, the synchronous tracking code is secretly hidden deep within Google Tag Manager!"
@verlok.bsky.social is calling me out, and I'm not sure I like it. 😅 But some great tips on common INP mistakes.
#PerfNow #webperf
@verlok.bsky.social is calling me out, and I'm not sure I like it. 😅 But some great tips on common INP mistakes.
#PerfNow #webperf
#perfnow question for @marcysutton.com : what do you think about those scripts that you can add to your website and (claim to) make your website accessible effortlessly? Hit us.
October 30, 2025 at 11:03 AM
#perfnow question for @marcysutton.com : what do you think about those scripts that you can add to your website and (claim to) make your website accessible effortlessly? Hit us.
Good morning from Amsterdam
October 30, 2025 at 8:45 AM
Good morning from Amsterdam
Now I have an aged RUM bottle! #rumarchive at #perfnow. Thanks to @programmingart.bsky.social for the sticker 😊
October 30, 2025 at 8:44 AM
Now I have an aged RUM bottle! #rumarchive at #perfnow. Thanks to @programmingart.bsky.social for the sticker 😊
You know when you copy a piece of code, then you copy another one and you lose the previous one? No more clipboard stress. Finally, multiple clipboard landed on macOS.
www.andreaverlicchi.eu/blog/how-to-...
www.andreaverlicchi.eu/blog/how-to-...
September 16, 2025 at 8:32 AM
You know when you copy a piece of code, then you copy another one and you lose the previous one? No more clipboard stress. Finally, multiple clipboard landed on macOS.
www.andreaverlicchi.eu/blog/how-to-...
www.andreaverlicchi.eu/blog/how-to-...
Don't settle for "good" LCP (Largest Contentful Paint) in website loading performance. It's time for new thresholds.
www.speedkit.com/blog/dont-se...
www.speedkit.com/blog/dont-se...
Don’t Settle for “Good”: It Is Time for New LCP Thresholds | Speed Kit
We at Speed Kit are now extending Google's LCP thresholds in all our dashboards by adding two additional buckets to show more details for page loads faster than 2.5s.
www.speedkit.com
September 10, 2025 at 1:29 PM
Don't settle for "good" LCP (Largest Contentful Paint) in website loading performance. It's time for new thresholds.
www.speedkit.com/blog/dont-se...
www.speedkit.com/blog/dont-se...
Speaking today at Performance Observer meetup! 16:00 UTC on improving slow interactions (INP). Join us! performanceobserver.dev/events/episo... #webperf #inp
Ep. 3: Web perf allies and INP in the trenches | PerformanceObserver
In this episode we have Andrea Verlicchi walking us through some real-world case studies of optimizing INP, and Ethan Gardner will discuss how to make allies to enable our efforts to make websites fas...
performanceobserver.dev
April 16, 2025 at 9:36 AM
Speaking today at Performance Observer meetup! 16:00 UTC on improving slow interactions (INP). Join us! performanceobserver.dev/events/episo... #webperf #inp
@matteobordone.bsky.social non so se seguire Twin Peaks ascoltando le tue descrizioni delle puntate su #T__B, oppure abbonarmi a Paramount+ e guardarmi gli episodi. Ci penserò ancora un po’ su.
January 24, 2025 at 6:58 AM
@matteobordone.bsky.social non so se seguire Twin Peaks ascoltando le tue descrizioni delle puntate su #T__B, oppure abbonarmi a Paramount+ e guardarmi gli episodi. Ci penserò ancora un po’ su.
SVG Optimization for Web Performance - Want to boost your website's speed and visual appeal? SVGs are a great way to do it. Check out my latest blog post on optimizing SVG images for performance: www.andreaverlicchi.eu/blog/loading...
#webdev #webperf #webperformance #svg
#webdev #webperf #webperformance #svg
Optimizing SVG Usage for Web Performance: A Comprehensive Discussion
Various techniques to render SVGs compared, including inline SVGs, the `<img>` tag, CSS backgrounds, and SVG sprites. Here's a summary of the key insights and recommendations from a design and web per...
www.andreaverlicchi.eu
December 7, 2024 at 1:12 AM
SVG Optimization for Web Performance - Want to boost your website's speed and visual appeal? SVGs are a great way to do it. Check out my latest blog post on optimizing SVG images for performance: www.andreaverlicchi.eu/blog/loading...
#webdev #webperf #webperformance #svg
#webdev #webperf #webperformance #svg
Last week I attended the most esteemed conference in the realm of web performance in Europe: performance.now. Here's a detailed account of my participation and insights gained from attending and contributing.
#perfnow #perfnow2024 #webperf #conference
#perfnow #perfnow2024 #webperf #conference
My experience at performance.now() 2024: Europe's premier web performance conference
A detailed account of my participation and insights gained from attending and contributing to performance.now(), the top web performance conference in Europe.
www.andreaverlicchi.eu
November 18, 2024 at 10:22 AM
Last week I attended the most esteemed conference in the realm of web performance in Europe: performance.now. Here's a detailed account of my participation and insights gained from attending and contributing.
#perfnow #perfnow2024 #webperf #conference
#perfnow #perfnow2024 #webperf #conference
Reposted by Andrea Verlicchi
November 14, 2024 at 11:15 AM
November 15, 2024 at 4:42 PM
Big claps to @jackfranklin.bsky.social for the talks at #perfnow!
I like these dense talks full of tips on what I use daily, I always learn something new.
Will definitely give feedback on a couple of things later either at the booth or via crbug.com/new
I like these dense talks full of tips on what I use daily, I always learn something new.
Will definitely give feedback on a couple of things later either at the booth or via crbug.com/new
November 15, 2024 at 9:37 AM
Big claps to @jackfranklin.bsky.social for the talks at #perfnow!
I like these dense talks full of tips on what I use daily, I always learn something new.
Will definitely give feedback on a couple of things later either at the booth or via crbug.com/new
I like these dense talks full of tips on what I use daily, I always learn something new.
Will definitely give feedback on a couple of things later either at the booth or via crbug.com/new
Question to @jackfranklin.bsky.social at #perfnow: are the devtools exported traces with annotations visible also on trace.cafe?
November 15, 2024 at 9:34 AM
Question to @jackfranklin.bsky.social at #perfnow: are the devtools exported traces with annotations visible also on trace.cafe?
I got interviewed from @henrihelvetica.bsky.social at the amazing #perfnow conference in beautiful Amsterdam. Check it out his YouTube youtube.com/@henrihelvet...
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November 14, 2024 at 4:18 PM
I got interviewed from @henrihelvetica.bsky.social at the amazing #perfnow conference in beautiful Amsterdam. Check it out his YouTube youtube.com/@henrihelvet...
