Edge Function Region Selector

Edge functions run in data centers close to your users, reducing network latency by 50-200ms compared to a single centralized region. For APIs serving users globally, deploying to multiple edge regions can significantly improve response times. Cloudflare Workers deploy to 300+ locations globally by default; AWS Lambda@Edge deploys to CloudFront PoPs.

For US-focused traffic: US East (N. Virginia / Ohio) and US West (Oregon / N. California) cover 95%+ of US users with under 50ms latency. Add US Central (Iowa) for Midwest coverage. For a US-only audience, 2-3 US regions cover the vast majority of users adequately.

For global coverage: prioritize US East, EU West (Ireland/Frankfurt), and AP Southeast (Singapore/Tokyo). These three regions cover the largest concentrations of internet users and developers. Add US West, AP South (Mumbai), and SA East (São Paulo) for comprehensive global coverage. Cloudflare Workers handles this automatically.

Cloudflare Workers deploy to all 300+ Cloudflare PoPs globally with zero configuration — no region selection needed. AWS Lambda@Edge deploys to CloudFront edge locations (~450 globally) but requires origin Lambda in a specific region. Vercel Edge Functions deploy to Vercel's network (powered by Cloudflare). For most use cases, Cloudflare Workers provides the best global coverage automatically.

Weight regions by your actual user traffic distribution. If 60% of users are in the US, 25% in EU, and 15% in Asia, deploy proportionally. Use your analytics (Cloudflare Analytics, Google Analytics, or CDN logs) to determine actual geographic traffic distribution. Over-deploying to low-traffic regions adds cost without meaningful latency improvement.