Unattributed Navigation Overhead exposes the part of Time to First Byte that Navigation Timing cannot explain, including hidden cross-origin redirects.

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.

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.

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

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...

YouTube video by Web Conferences Amsterdam

In October 2020, Chrome enabled HTTP/3 by default . HTTP/3 ( RFC 9114 ) runs over IETF QUIC ( RFC9000 ). Default-enabling HTTP/3 in Chrome ...

YouTube video by Web Conferences Amsterdam

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...

YouTube video by Web Conferences Amsterdam

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...

December's meetup will feature Paul Calvano, on his return from the PerfNow conference in Amsterdam. **Agenda** * 4:30 pm: Arrive & networking * 5:00 pm: Talk starts * 5:

YouTube video by We Love Speed

YouTube video by We Love Speed

YouTube video by We Love Speed

An introduction to the Frustration Index

Performance chapter of the 2024 Web Almanac covering Core Web Vitals, with deep dives into the Largest Contentful Paint, Cumulative Layout Shift, and Interaction to Next Paint metrics and their diagno...