The missing link: UNO

Sep 16, 2025, 4:00 PM UTC (see full event)

Meet UNO, the missing link in any TTFB analysis. Without Unattributed Navigation Overhead you are lost, because TTFB is rarely the sum of Redirect+DNS+TCP+TLS in the field! Understanding UNO has saved Tim countless hours in RUM.

In this talk, Tim will share RUM examples why understanding and measuring UNO is crucial in 2025.

Tim Vereecke loves speeding up websites and likes to understand the technical and business aspects of WebPerf since 15+ years. He is a web performance architect at Akamai and also runs scalemates.com: the largest (and fastest) scale modeling website on the planet.