Your page contains JavaScript that may perform heavy computations, which can block the main thread and make your page feel unresponsive. This directly impacts Interaction to Next Paint (INP) scores.
JavaScript code that performs intensive calculations or data processing on the main thread.
Move heavy computations to Web Workers, break up long tasks with setTimeout, or optimize algorithms for better performance.
Keeping the main thread free ensures the page remains responsive to user interactions, improving INP scores and overall user experience.
This issue can affect your site's search engine rankings and user experience. Addressing it promptly helps ensure optimal performance and visibility in search results.
Black SEO Analyzer automatically checks for this warning during site analysis, along with hundreds of other technical SEO issues.
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