A practical Core Web Vitals checklist for marketing sites

Core Web Vitals audits often turn into a list of one hundred suggestions with no priority. In practice, a handful of fixes account for most of the improvement on a typical marketing site.

Start with the largest contentful element. On most corporate homepages that is the hero image or heading. Serve the hero image in a modern format, size it correctly for each breakpoint, and never lazy-load it. Preload the font used by the hero heading and set a sensible fallback so text renders immediately.

Interaction delay is usually caused by third-party scripts. Audit every tag in your tag manager and ask whether it earns its place. Defer anything that is not needed for the first interaction, and load chat widgets only after user intent.

Layout shift is nearly always missing dimensions. Set explicit width and height on every image and embed, reserve space for banners and cookie notices, and avoid injecting content above existing content after load.

Finally, measure with field data, not just lab tools. Lab scores are useful for debugging, but the numbers that matter come from real visitors on real networks.