A Pre-Launch Core Web Vitals Checklist

A Pre-Launch Core Web Vitals Checklist

Before you publish a new page, a quick run-through catches the common speed mistakes while they're still cheap to fix. Think of it like a pilot's pre-flight checklist — boring, but it prevents the crash.

Run these before going live:
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1. Every image has width and height set, so nothing shifts (helps CLS).
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2. The hero image is preloaded and never lazy-loaded (helps LCP).
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3. Below-the-fold images use loading lazy (helps LCP).
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4. Non-critical scripts have defer added (helps INP and LCP).
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5. Fonts use font-display swap with a matched backup (helps CLS).
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6. You tested on the Mobile tab, not just desktop.

Six checks, maybe ten minutes, and you ship clean instead of fixing it under pressure later.

Try this: Copy these six lines somewhere and run them on your next new page before publishing.