How to Fix Core Web Vitals on SaaS Landing Pages for Better First Visits

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Google's Core Web Vitals framework measures three key aspects of landing page performance: Largest Contentful Paint (LCP) for loading speed, Interaction to Next Paint (INP) for responsiveness, and Cumulative Layout Shift (CLS) for visual stability, with defined thresholds for each. Developers are advised to use real-user field data from tools like PageSpeed Insights before running broad speed optimizations, focusing on the specific metric and URL that is underperforming. For LCP, best practices include embedding hero images directly in HTML, avoiding lazy-loading, and assigning high fetch priority rather than preloading all assets. INP issues on SaaS pages commonly stem from heavy JavaScript tasks blocking interactions like pricing toggles or modals, which can be addressed by deferring optional widgets and splitting long tasks. CLS can be reduced by reserving space for images, banners, and embedded content using defined dimensions or aspect ratios to prevent layout shifts after the page begins rendering.

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ProgrammingDEV Community ·

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