Case Study: 50ms API Response Times with Cloudflare Workers
Real numbers from Verbira CRM: how edge deployment cut API latency from 200ms to under 50ms globally, without caching complexity.
Before: Traditional Architecture
Verbira CRM originally ran on a traditional server setup:
- Single region deployment (US East)
- API latency: 150-300ms depending on location
- Database queries: 50-100ms
- Cold starts: 500ms+ on first request
Users in Europe and Asia experienced noticeable lag.
After: Edge-First Migration
We migrated to Cloudflare Workers + D1:
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- Edge deployment: Code runs in 300+ locations
- D1 replication: Database queries hit nearest replica
- Zero cold starts: Workers are always warm
- Automatic optimization: Cloudflare routes to fastest edge
Results
Global Latency Improvements
| Region | Before | After | Improvement |
|---|---|---|---|
| US East | 150ms | 30ms | 80% faster |
| Europe | 250ms | 45ms | 82% faster |
| Asia | 300ms | 50ms | 83% faster |
User Experience
- Page load time: Reduced from 1.2s to 400ms
- API responsiveness: Users report "instant" feel
- Error rate: Dropped from 2% to 0.1%
Technical Details
D1 Replication
D1 automatically replicates data to edge locations. Queries hit the nearest replica, cutting database latency in half.
Worker Optimization
We optimized our Worker code for edge execution:
- Minimal dependencies
- Fast JSON serialization
- Efficient database queries
- No heavy computations
Cost Impact
Surprisingly, edge deployment reduced costs:
- No server management overhead
- Pay-per-request pricing scales with usage
- No idle server costs
- Automatic DDoS protection included
Key Takeaway
Edge deployment isn't just about performance—it's about global accessibility. By running code close to users, we made Verbira CRM feel native worldwide, not just in North America.
The migration took 3 weeks and the performance gains were immediate.