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Optimizing Core Web Vitals: Reducing INP and LCP to 99+ Score

Practical engineering strategies to achieve sub-100ms INP and top-tier Lighthouse performance scores.

Alex Rivers •
Optimizing Core Web Vitals: Reducing INP and LCP to 99+ Score
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1. Demystifying Interaction to Next Paint (INP)

INP measures user interface responsiveness by tracking the latency of all user interactions (clicks, taps, keypresses) throughout the page lifecycle.

2. Deferring Non-Critical JavaScript Payloads

Always defer heavy analytics and secondary scripts until after main thread rendering is complete:

3. Image Optimization & Priority Preloading

Always pre-render critical hero images with priority loading tags such as fetchpriority='high' and modern AVIF format.

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Alex Rivers

Alex Rivers

Verified Author

Senior Principal Engineer & Distributed Systems Lead. Writing about cloud architecture, Rust, and scalable web backend systems.

📍 San Francisco, CA 🌐 Website
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