Separate lab diagnosis from field experience
Controlled tests help reproduce issues. Field data shows how eligible users experienced pages over time. They answer different questions.
Performance metrics help identify experience problems, but need page, device and field context before they guide priorities.

Representative templates
Loading and interaction
Layout stability
Field and lab evidence
Controlled tests help reproduce issues. Field data shows how eligible users experienced pages over time. They answer different questions.
Large media, delayed fonts, heavy scripts, long tasks and late layout changes should be traced to the page elements that create them.
Image guidance, third-party review, budgets and representative checks help keep later content and features from reversing improvements.
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