How Kapital.kz Fixed All Three Core Web Vitals From Red to Green

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Kapital.kz, a high-traffic business and finance news portal in Kazakhstan built on Next.js, had all three Google Core Web Vitals — LCP, INP, and CLS — in the poor-performing red zone. Engineers tackled LCP by optimising the hero image loading on article pages, which serve as individual landing points for Google search traffic. INP was improved by fixing how Google Ads scripts were loaded and removing heavy JavaScript libraries from the main bundle to free up the browser's main thread. CLS issues were resolved by reserving fixed space for ad slots before they loaded and correcting height estimation in the infinite scroll feature to prevent layout jumps. The combined fixes brought all three metrics into Google's green zone, directly benefiting the site's search rankings and user experience.

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