Why it matters
A page can pass a quick desktop smoke test and still lose users on mobile because the payload is too heavy or the page waits on too many vendors.
How it works
FixWeb reads browser resource timing after render and groups resources by initiator type, transfer size, and first-party vs third-party origin.
Site impact
Heavy scripts and third-party tags commonly degrade LCP and INP, while excess fonts and images add bandwidth and layout work.
// how fixweb tests for it
How FixWeb tests for it
The rendered crawl records approximate transfer bytes plus script, stylesheet, image, font, and third-party counts for each page.
How to improve
Set performance budgets, remove unused vendors, split and defer JavaScript, compress assets, cache immutable files, and optimize the likely LCP image.