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Field data vs lab data

Definition

Field data is collected from real visitors' devices and connections (the CrUX dataset). Lab data is a single simulated run on synthetic hardware. Google evaluates your store on field data — so a lab score can flatter you while real shoppers suffer.

Defined in Shopify Speed & Core Web Vitals in the Agentic Era.

Get your Readiness Score

100 points across catalog, schema, product pages and checkout, with the three fixes that matter most.