Next.js Performance: How We Achieved a 100/100 Lighthouse Score
A deep dive into Core Web Vitals optimization, FCP reduction and mastering Tailwind CSS for reference-grade speed.
The Challenge: Heavy Bundles & Slow Starts
Despite using Next.js, our initial metrics were poor. Large CSS bundles, unoptimized font loading, and hydration delays were destroying our "Authority" status before users even saw the page.
The Solution: Optimization Strategy
We adopted a surgical approach to optimization. We didn't just install plugins; we re-architected how assets are served.
Critters & Inline CSS
We implemented 'Critters' to inline critical CSS directly into the HTML head. Unlike traditional methods requiring a full external stylesheet download before render, Critters identifies the exact styles needed for the initial viewport and inlines them. This eliminates round-trip latency, significantly improves First Contentful Paint (FCP) and makes page loading feel instant.
Tailwind JIT & Purge
We switched to Tailwind's Just-in-Time (JIT) compiler. Unlike the classic 'purge' approach that filters a massive generated file, JIT produces styles on demand as you write templates. This guarantees zero unused CSS in production by definition, supports arbitrary values (e.g. w-[17px]) and reduces build times from seconds to milliseconds.
Result: Instant Authority
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