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Unattributed Navigation Overhead (UNO) Is Underrated10 hrs

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

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Web-Perf Wednesday 005 – RUM Needs More Than a Percentile10 hrs

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

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Introducing LUX Sidecar: Your SpeedCurve Companion1 day

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

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When Safari’s ‘Ignore Cache’ Ignored Cache-Control2 days

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

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