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Never underestimate the fragility of trust online. Users are constantly evaluating whether a site feels safe enough to enter personal details and complete transactions. Slow load times or janky interactions can subtly undermine that trust. When pages lag, people start to question other things […]
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 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…
Low- and Mid-Tier Mobile for the Real World (2025)
It’s important to remember that ‘low-tier’ does not mean old. Likewise, ‘mid-tier’ does not mean ‘a flagship from 2018’. They are a device class in…
Tammy Everts 
Florian Thoma
Harry Roberts