No-Vary-Search lets HTTP caches ignore irrelevant query parameters such as UTM tags, while still keeping meaningful ones like product variants in the cache key.

I’m a news junkie (well, really an information junkie). Usually I consume it through a combination of listening to WTOP news radio when commuting and a Feedl...

We recently changed how Shopify uses Early Hints on storefronts. Instead of relying only on resource hints added by theme authors, we now scan generated HTML and automatically identify resources that ...

Like most of my recent projects, it started out with an itch I wanted to scratch so, instead of just answering the question I wanted answered, I WAY over-eng...

Robin Marx has been asking me for a Compression Dictionary Transport (RFC 9842) test tool for a long time (since well before AI was actually useful for this...

I was getting really frustrated with Apple’s search implementation for the “Messages” app (both on mobile and a MacBook) when trying to find specific message...

Core Web Vitals data from ten leading online retailers reveals that "good" for Google may not be good enough for your users or your business.

Maybe? That’s the question I’m hoping to answer over the next … ??.

Ever since browser vendors started exposing advanced performance telemetry APIs directly to the page, such as the Performance Timeline, Long Animation Frames...

On 19th and 20th of November 2026, the seventh edition of performance.now() will take place in Amsterdam—a single track conference, covering today’s most important web performance insights.

Explainer for the Cross-Origin Storage (COS) API. Contribute to WICG/cross-origin-storage development by creating an account on GitHub.

Run one-off page speed tests against any URL without adding the page to your monitoring dashboard.

No-Vary-Search lets HTTP caches ignore irrelevant query parameters such as UTM tags, while still keeping meaningful ones like product variants in the cache key.

We upgraded Speculation Rules to moderate eagerness on all Liquid storefronts. Desktop navigations are now 285ms faster at the median, with near-zero TTFB.

Try out the Container Timing performance measurement API in origin trial from Chrome 148

Take a last chance to try out the Soft Navigations API before release with this final origin trial.

I’ve been wanting to build a 100% client-based waterfall tool for a long time. Something with a much more modern rendering engine and UI than WebPageTest’s s...

Should we ship jQuery, React and other popular frameworks with browsers so sites don’t have to re-download the same frameworks over and over?

At Squarespace, many of our core products are built on web standards, and our engineers are constantly pushing the boundaries of the web’s capabilities. Occasionally, those boundaries reveal a limitat...

I’ve used AI to generate a few websites over the last month or so and not too long before that I was helping my son create a website on Wix so I thought it m...

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Post from February 27, 2026

Read the full report for the results of 614 global websites tested from Beijing (China), Virginia (US), and London (UK). Here's what we discovered about how global websites behave for users in Mainlan...