Performance Triage Pocket Guide
Use a quick reference to map performance complaints to the first metric and investigation path.
Metric Users wait for the main hero or product image to appear. Which metric points first? LCP: Largest Contentful Paint. Find the LCP element, then inspect request timing, size, priority, server time, and render blockers. Compare Late content vs moving content Both feel slow, but they require different fixes. Objection Can we just show a spinner so users know something is happening? The page has a late LCP element and visible layout movement. Your line A spinner may communicate waiting, but it will not make meaningful content arrive sooner or stop the CTA from moving. Status feedback can mask delay…
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