Microsoft Edge Team
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JavaScript must be downloaded, then run through a JIT compiler (even if you don’t use it), and then executed, and all this must be done before any of the JavaScript can start rendering the UI. This introduces a lot of delay before users can see the UI, especially on low-end devices.
Core Mobile Vitals: Understand how your users feel about your app
if you ask a mobile team “is your app healthy?”, you’ll probably get a 20-minute technical briefing that involves crash rates, ANRs, Apdex scores,…
Mateusz Krzeszowiak
Store Speed and Conversion: What the Data Shows
Speed matters—but it's one of many variables. Our data shows a clear correlation between performance and conversion, though not direct causation.…
The speed of trust: How slow pages hurt your brand
Never underestimate the fragility of trust online. Users are constantly evaluating whether a site feels safe enough to enter personal details and…
The Decline of WebPageTest After the Catchpoint Era
The spirit of openness, clarity, and technical depth that defined it has been overshadowed by commercialisation and integration. I understand how…
Obs.js – context-aware web performance for everyone
Obs.js reads a handful of browser signals (Navigator and Battery APIs) to infer connection strength, battery status, and device capability. It exposes…
Tammy Everts
Florian Thoma
Harry Roberts