• New Sep 30, 2026

  Web-Perf Wednesday 011 – SpeedCurve’s INP Observer Missed Its Threshold

  A long-standing lux.js bug left Event Timing on its 104 ms default, while browser releases improve testing and rendering...

• New Sep 23, 2026

  Web-Perf Wednesday 010 – Safari Keeps Scrolled Content in Place

  Safari 27 adds scroll anchoring, tighter HTTP caching, and static Service Worker routes, while Chrome improves performance...

• New Sep 16, 2026

  Web-Perf Wednesday 009 – CrUX Makes Ad Weight Public

  CrUX adds public ad count, density, CPU, and network metrics, giving publishers and advertisers a shared view of real ad...

• New Sep 9, 2026

  Web-Perf Wednesday 008 – Good INP Rates Keep Falling

  CrUX shows another fall in good INP experiences, making careful attribution more useful than a quick...

• New Sep 2, 2026

  Web-Perf Wednesday 007 – Chrome Makes Busy Workers Measurable

  Chrome 153 starts exposing dedicated-worker congestion to RUM, while browser releases tighten privacy, module recovery, and image...

• New Aug 26, 2026

  Web-Perf Wednesday 006 – Faster Browser Releases Change Your RUM Population

  Chrome and Firefox are moving to two-week releases, making browser cadence part of how teams interpret RUM and plan performance...

• New Aug 20, 2026

  How to Find an Exact Gmail Thread with Codex or Claude

  Use Gmail’s Message-ID to point Codex or Claude at one exact email and retrieve the complete conversation rather than a plausible...

• New Aug 20, 2026

  Unattributed Navigation Overhead (UNO) Is Underrated

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

• New Aug 19, 2026

  Web-Perf Wednesday 005 – RUM Needs More Than a Percentile

  LUX Sidecar adds context to RUM, while browser-tool fixes show why measurement conditions and small debugging details...

• New Aug 18, 2026

  Introducing LUX Sidecar: Your SpeedCurve Companion

  LUX Sidecar is a small SpeedCurve RUM plugin that adds browser and navigation context to your real-user performance...

• New Aug 17, 2026

  When Safari’s ‘Ignore Cache’ Ignored Cache-Control

  Safari Technology Preview 250 fixed a subtle Web Inspector bug that overwrote page-authored Cache-Control request headers when the resource cache was...

• New Aug 12, 2026

  Web-Perf Wednesday 004 – A Quiet Week Is Time to Investigate

  A quiet week in web performance is a useful chance to investigate the evidence and problems teams already...

• New Aug 5, 2026

  Web-Perf Wednesday 003 – Native SPA Metrics Have Arrived

  Chrome 151 and web-vitals v6 bring native SPA measurement into production, while new browser controls reshape device and third-party...

• New Jul 29, 2026

  Web-Perf Wednesday 002 – The Metrics Don’t Tell the Whole Story

  CrUX’s seasonal decline, Safari 27’s user-experience fixes, richer INP attribution, and long-session third-party costs all demand better...

• New Jul 26, 2026

  Measuring Component Performance with the Container Timing API

  Measure how entire components render with the Container Timing API: how it differs from Element Timing, where it helps, and how to try it...

• New Jul 21, 2026

  Low- and Mid-Tier Mobile for the Real World (2026)

  The 2026 update to my real-world device testing recommendations paints a clearer picture than...

• New Jul 15, 2026

  Web-Perf Wednesday 001 – SPAs Are Finally Becoming Measurable

  Chrome 151 brings native soft-navigation measurement closer, alongside better redirect timing, revealing CrUX data, and more trustworthy browser...

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