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$ curl repovive.com/roadmaps/frontend-system-design-interview-prep/performance-optimization/image-optimization

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$ curl repovive.com/roadmaps/frontend-system-design-interview-prep/performance-optimization/image-optimization

Repovive

Image Optimization - Performance Optimization | Frontend System Design Interview Prep | Repovive

Repovive.

Frontend System Design Interview Prep17 sections · 206 units12h total

Open in Course

Image Optimization

Largest culprit for slow loads

Images often account for most page weight. Optimize them aggressively.

Format selection:

WebP: $25$ - $35$ % smaller than JPEG
AVIF: Even smaller, less browser support
SVG: For icons and simple graphics

Responsive images:

<img srcset="small.jpg 480w, large.jpg 1080w"
     sizes="(max-width: 600px) 480px, 1080px" />

Lazy loading: Load images as they enter viewport.

CDN and compression: Serve optimized images from edge locations.