TTFB is a notoriously difficult performance metric, because it has so many different definitions and nuances.
New features like Early Hints and Speculation Rules only make that worse.
My new blog highlights these issues so you know what to keep in mind:
📢 Excited to have @TimVereecke join me Wednesday to talk shop about 2025 and details from a recent blog post from he and @programmingart re: performance in 2025. Join us!
✨ SPDY STREAM 003 ✨
📆 Wed July 9th
⏰ 1p EST
🔗 bit.ly/spy-stream-003
🔗 blog post:
For this year's #webperf calendar, I wrote "Top 8️⃣ things I want in the Devtools Network Panel".
I often struggle to debug networking features in browsers (like DNS HTTPS records, 0-RTT, and Happy Eyeballs 👀) and have some ideas on how to improve that!
This year, I again had the honour of authoring the HTTP chapter of the Web Almanac: almanac.httparchive.org/en/2024/http
It's full of interesting stats on tech like HTTP/3, DNS HTTPS records, preloads, 103 Early Hints and the FetchPriority API.
It also has Pirates 🏴☠️ and Marry Poppins 🌂!