Key Takeaways
- Edge computing reduces latency from 100-300ms (centralized) to 5-20ms by running code near the user.
- Cloudflare Workers is the leading edge platform with 300+ global locations and a generous free tier.
- Edge functions are ideal for personalization, A/B testing, geolocation, and API proxying without full server infrastructure.
Practical Edge Computing Use Cases
- A/B testing: Route users to different page versions at the edge without client-side flickering.
- Geolocation: Serve localized content, pricing, or language based on user location without client-side detection.
- Authentication: Validate JWT tokens at the edge, rejecting unauthorized requests before they reach your origin.
- API proxying: Add headers, transform responses, and cache API calls at edge locations.
- Image optimization: Resize and format images on-the-fly at the edge based on device characteristics.
Limitations
Edge functions have constrained runtimes: limited execution time (typically 50ms-30s), no persistent connections, restricted API access (no direct database connections in most platforms). Use them for lightweight processing, not heavy computation.
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