Separate field and lab data
Field data represents real visits over time. Lab data reproduces one controlled test. Use field data to locate the affected routes and devices, then use lab traces to explain why the experience occurs.
Diagnose Largest Contentful Paint
Identify the actual LCP element and split time across server response, resource discovery, resource loading and element render delay. The correct fix might be caching, preload priority, image delivery, CSS or removing delayed visibility.
Diagnose Interaction to Next Paint
Reproduce common interactions and inspect the event delay, processing time and presentation delay. Long JavaScript tasks, expensive rendering and unnecessary state updates often matter more than the visual effect itself.
Diagnose Cumulative Layout Shift
Find elements that move without user input. Reserve media and advertising space, keep font swaps stable and avoid inserting banners or controls above existing content after the first render.
Prevent regression
Set route and template budgets, test representative pages in continuous integration where useful and retain real-user monitoring after release. Performance is a product constraint, not a one-off clean-up task.
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