Kevin Farrugia

Web performance consultant. Be kind. He/him.

Find me on BlueSky:

[Kevin Farrugia @imkevdev]

@Rich_Harris @nargilelelele The data and query are publicly available and I would welcome your feedback. The LCP measurement is taken from CrUX, so it includes pre-rendering but no soft navigations.

The number of client-side Astro sites (mobile) is very small at 128.

https://t.co/2M6neOHpDI

[Kevin Farrugia @imkevdev]

@samthor @Indiequest1 @malchata However I cannot tell the extent to which it affects Kuto. I do not expect it to have a significant impact and from the tests I ran so far, the impact is tiny.

[Kevin Farrugia @imkevdev]

@samthor @Indiequest1 @malchata The core problem is that when streaming, V8 "guesses" whether the script will be used as a module or not, since that will affect how the script is parsed. If it guesses incorrectly, it ignores the streaming parsing results and reparses it again.

[Kevin Farrugia @imkevdev]

@firt Is there a list of affected APIs? We noticed that the WebShare API is not working well either (even when the app is opened in Safari browser)

[Kevin Farrugia @imkevdev]

@iamakulov Good luck! That's a nice write-up too. :)

[Henri Helvetica 🇭🇹 👨🏾‍🚀 🚀 @HenriHelvetica]

🚀 the second is another course from the Google team on Web/Dev. I talked about this w/ @imkevdev @ @PerfNowConf. Another free course:
https://t.co/g5V3x6uGTQ
Both can be done at your own place, but are meant to really bring you to *speed* on modern perf (2/n) RT?
#100DaysOfPerf

[Henri Helvetica 🇭🇹 👨🏾‍🚀 🚀 @HenriHelvetica]

🚀 On day 2 of #100DaysOfPerf, want to share 2 foundational resources :

1. @scottjehl launched a course that is now accessible from @RealWebPageTest , for FREE:
https://t.co/ZXjPkCQwY9
This is something for those really trying gather what modern #webperf is like. (RT?) (1/n)

[Stoyan Stefanov 🪩 @stoyanstefanov]

🪩 Web Performance calendar bonus 4
🔗 https://t.co/EcU0pEybX3
🎇 Nishu Goel (@TheNishuGoel) not only shows us 70% perf improvement with the help of Server-Timing
🛠️ but also ships a new open source tool to go with the article

And that's a wrap. Happy 123123 day and 2024 year!

[Stoyan Stefanov 🪩 @stoyanstefanov]

🪩 Web Performance calendar day 2 with @kurtextrem
⏱️ revisiting a study on parsing large chunks of JSON, e.g. those used to pass state in SPA-like apps
🙀 surprise: things in 2023 look different than 2019
🔗 https://t.co/xf7fAW2aKj

[Matt Hobbs (@[email protected]) @TheRealNooshu]

The video of my @PerfNowConf talk “Bridging the Digital Divide using Web Performance” is now available to watch! 😍

The video, presentation, notes, and all references are available here: https://t.co/aGDYTph4UF

I enjoyed writing it,I hope you enjoy it too.
#webperf #perfmatters

[performance.now() conference @PerfNowConf]

Noisy Real User Monitoring (RUM) data can ruin your day! At #PerfNow, @TimVereecke introduced a fresh concept called “Human Visible Navigations” (HVN) to tackle this risk.

Slides: https://t.co/SpFoC2mpSi
https://t.co/FqOX7tUUKT

[Kevin Farrugia @imkevdev]

That was fun! 😁 Thanks Henri.

[Henri Helvetica 🇭🇹 👨🏾‍🚀 🚀 @HenriHelvetica]

✨ The Hallway Track w/ @imkevdev ✨
Malta's finest Kevin Farrugia, Web Perf Consultant was also my guest. He was one of the main contributors of the https://t.co/euUkcwlFno perf course. We chatted about his start as well as perf literacy. Enjoy!
🎥: https://t.co/o7nhmhNJQa

[Firefox Nightly 🔥 @FirefoxNightly]

<iframe loading=lazy> has landed. Lazily loaded iframes are only loaded when visible, speeding up initial page load.
See https://t.co/zQTfdLQQS7

[Kevin Farrugia @imkevdev]

@TimVereecke What do you mean by "CSS property to render elements only when closed"?

[Barry Pollard @tunetheweb]

@imkevdev and @malchata have launched “Learn Performance”, the latest in our series of free courses from @ChromiumDev . Check it out!

https://t.co/uCCZgjG9Ub

[Kevin Farrugia @imkevdev]

Munich tested a number of different methods to protect cyclists on bicycle lanes. Would be nice if #malta even pretended to try.🤷
https://t.co/3oGiOALTHh

(Photo from July 2022)

[Addy Osmani @addyosmani]

Tip: In @ChromeDevTools you can now hide network requests from Chrome extensions! 😍 Huge for focusing on just your code when profiling performance.

[Chrome UX Report 📊 @ChromeUXReport]

Do you use the CWV Tech Report? https://t.co/KrczJX28g3
It merges the CrUX dataset and @HTTPArchive crawl data to trend CWVs by technology.

We're working on a brand new version with a new UI and would love to hear how you use the current version:
https://t.co/C6hnyVnTGM

[Kevin Farrugia @imkevdev]

@iamakulov This was client side only, no server side rendering. 🫣 And similarly, I wouldn't expect the batching to have such an impact. Would the "yielding" in performUnitOfWork work even when not using useTransition? I will try to create a repro somehow.

[Kevin Farrugia @imkevdev]

@iamakulov have you come across any case studies on the impact to Long Tasks or INP after upgrading to React 18 (before even using the new APIs)? TIA. 🙏