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Tim Vereecke

@timvereecke.bsky.social

Loves speeding up websites. Web performance architect @Akamai, also runs https://www.scalemates.com #WebPerf #PageSpeed #SEO

45 Posts628 Follower167 Folgt
performance.now() conference@perfnow.nl · 2d ago

Oh dear, speakers are being announced in carload lots! Today we add bsky.app/profile/clif... about Core Mobile Vitals bsky.app/profile/jpam... as our second MC bsky.app/profile/mach... about selling web performance Come join them at perfnow.nl

performance.now(); 19th and 20th of November 2026, Amsterdam

On 19th and 20th of November 2026, the web performance community will gather at performance.now() in Amsterdam to discuss today’s most important web performance insights.

perfnow.nl

Tim Vereecke@timvereecke.bsky.social · 2w ago

I really wish caniuse.com showed browser-specific usage percentages too. “1.28% of global users don’t support this” sounds insignificant. “9.6% of Safari users don’t support this” tells a very different story. Global usage can hide some pretty important details.

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Tim Vereecke@timvereecke.bsky.social · 4mo ago

While I’m a big fan of the Speculation Rules API, there used to be one major downside: prerendered pages ignored loading=lazy, causing all images to download. That changed 2 months ago.

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Tim Vereecke@timvereecke.bsky.social · 7mo ago

Sometimes, legacy applications use POST instead of GET to retrieve data. On Akamai, you can easily force caching of specific POST responses to improve both offload and performance. In the screenshot below, you can see the first (slow) and subsequent data retrievals using POST (fast, cached).

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Barry Pollard@tunetheweb.com · 8mo ago

From Chrome 145 (on general release next week!), DevTools we will start to show so called "soft" navigations and "Soft LCP" in the Performance Panel traces. These are for SPAs which don't do a full page load, but instead "fake it" by updating the current page and pushing a new history entry. 1/5 🧵

Screenshot of a performance trace in Chrome DevTools with a few additional "Nav*" and "LCP*" markers. Hovering over the "LCP*" shows this is a "Soft LCP" and in the Summary panel when you click on it you see "Soft Largest Contentful Paint" and a "Learn more about Soft Largest Contentful Paint" link.
Barry Pollard@tunetheweb.com · 8mo ago

Think prefetch is not enough, but prerender is too risky for your site? Well then check out "prerender until script"—a new option we're testing for the Speculation Rules API now available for you to test on your site with an origin trial! developer.chrome.com/blog/prerend...

Speculation rules prerender until script origin trial  |  Blog  |  Chrome for Developers

Learn about the new prerender until script option for the Speculation Rules API, now available in origin trial.

developer.chrome.com

Stoyan Stefanov @stoyan.me · 2y ago

Web performance calendar day 28 with Tsvetan Stoychev's curriculum for teaching Real User Monitoring. Cup of rum? Sign me up! calendar.perfplanet.com/2024/wait-wh...

Wait? What? Web Performance Optimization is being studied in universities?

TL;DR: In this article I am sharing the good news that Web Performance Optimization is being studied in universities and I am laying out the plan of teaching Real User Monitoring which I will do for t...

calendar.perfplanet.com

Stoyan Stefanov @stoyan.me · 2y ago

Web performance calendar day 21 with @timvereecke.bsky.social giving us the gift of UNO (Unattributed Navigation Overhead) - an insight into the blind spot gaps between TTFB components calendar.perfplanet.com/2024/uno/

Unattributed Navigation Overhead (UNO)

I promise you, UNO (Unattributed Navigation Overhead) is the best Christmas present you will get this year! UNO, not the card game, is the missing piece for many of your unsolved performance puzzles...

calendar.perfplanet.com