Estimate mobile load time accounting for slower CPU and network conditions.
Mobile penalties compound: a slower CPU multiplies JavaScript execution while a slower network multiplies transfer. JavaScript-heavy pages suffer far more on mobile than image-heavy ones. Google indexes and ranks on mobile performance, so the mobile figure is the one that affects search visibility.
Mobile Page Speed
Mobile time = CPU portion × throttle factor + network portion × bandwidth ratio
Mobile time = CPU portion × throttle factor + network portion × bandwidth ratio Mobile penalties compound: a slower CPU multiplies JavaScript execution while a slower network multiplies transfer. JavaScript-heavy pages suffer far more on mobile than image-heavy ones.
Google indexes and ranks on mobile performance, so the mobile figure is the one that affects search visibility.
This calculator takes 5 inputs: Desktop load time, Mobile CPU slowdown factor, Mobile connection speed, Desktop connection speed, Share of load time spent on JavaScript. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.