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Testing performance on actual device should be mandatory for every project, as it makes so many issues obvious.
The best analouge you can buy for a representative P75 device today are ~$200 Androids from the last year or two, such as the Samsung Galaxy A50 and the Nokia G11.
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…
Alex Russell 
Tammy Everts
Florian Thoma
Harry Roberts