Product Engineering

How to Achieve a 100/100 Google Lighthouse Score on Your eCommerce Site

April 05, 2026 7 min read

Why Lighthouse Matters

Google Lighthouse measures your Core Web Vitals (LCP, FID, CLS). A low score means Google will actively demote your site in search rankings, and users will bounce before your hero image loads.

Technical Fixes for 100/100

1. Image Optimization

Never serve raw JPEGs. Use the Next.js <Image> component to automatically convert images to WebP/AVIF formats, resize them based on the user's device, and lazy-load images below the fold.

2. Third-Party Script Deferral

The #1 killer of page speed is marketing scripts (Facebook Pixel, Hotjar, Klaviyo). Use Next.js next/script with the strategy="lazyOnload" attribute so they only load after the user has begun scrolling.

3. Static Generation

If your product pages are Server-Side Rendered (SSR) on every request, your Time to First Byte (TTFB) will suffer. Use Incremental Static Regeneration (ISR) to pre-build product pages and serve them instantly from a CDN.

Need help speeding up your site? Oktuv's engineers specialize in extreme web performance.

Oktuv Growth Team

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