INP (Interaction to Next Paint)
A Core Web Vital that measures responsiveness—how quickly the interface updates after user input across the page’s lifecycle.
Interaction to Next Paint (INP) is a Core Web Vital that evaluates responsiveness by looking at the latency of interactions (clicks, taps, key presses) and the time until the next visual update. Unlike FID, which sampled the first input, INP reflects overall responsiveness, making it a truer measure of UX for interactive pages. It matters because slow responses increase frustration, reduce conversions, and can weaken page experience signals. INP influences JS execution strategy, main-thread scheduling, and UI patterns such as heavy modals or complex menus.
Key Takeaways:
- •Reduce long tasks and main‑thread blocking
- •Prioritize input responsiveness over cosmetic animations
Context:
A pricing page uses heavy client-side calculators.
Action:
Engineers chunk long tasks, add interaction-ready priorities, and minimize third‑party scripts.
Result:
INP improves from 380ms to 180ms; trial signups increase due to smoother interactions.
Related Terms
Core Web Vitals
Google’s user-centric performance metrics: LCP (loading), INP (interactivity), and CLS (visual stability) that influence page experience signals.
Page speed
Page speed influences speed, stability, and crawl/index efficiency. Solid technical execution improves user satisfaction and strengthens page experience signals that support durable visibility and conversions.
First Contentful Paint (FCP)
First Contentful Paint (FCP) aligns content with AI-driven experiences and answer engines so your expertise is selected, cited, and trusted across evolving search surfaces.
Largest Contentful Paint (LCP)
Measures loading performance by timing when the main content element (image or text block) becomes visible to users.
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