CDN Performance
CDN Performance Benefits
Without CDN: User → Origin (200ms)
With CDN: User → Edge (20ms)
What to Cache on CDN
| Content | TTL |
|---|---|
| Static assets (CSS/JS) | 1 year |
| Images | 1 week |
| API responses | Minutes |
Key Points
- Understanding CDN Performance is essential for production systems
- Always consider scalability and maintainability
- Test thoroughly before deploying to production
- Monitor performance and set up alerting
Common Patterns
- Validation: Always validate input at the boundary
- Error Handling: Use structured error responses
- Logging: Log key events for debugging
- Testing: Unit, integration, and load tests
- Documentation: Keep docs updated with code changes
Performance Optimization
Areas
- Database: Indexes, queries, connection pooling
- Caching: Multi-level, appropriate TTL
- Network: Compression, CDN, HTTP/2
- Code: Profiling, async, batch
Measurement
- Load testing
- Profiling
- APM tools
- Real user monitoring
Best Practices
- Set performance budgets
- Monitor in production
- Optimize hot paths
- Use appropriate data structures
Key Points
- Understanding CDN Performance is essential for production systems
- Always consider scalability and maintainability
- Test thoroughly before deploying to production
- Monitor performance and set up alerting
Common Patterns
- Validation: Always validate input at the boundary
- Error Handling: Use structured error responses
- Logging: Log key events for debugging
- Testing: Unit, integration, and load tests
- Documentation: Keep docs updated with code changes
Practice Problems
0 / 2 solved
CDN Performance Edge Cases
Identify and handle edge cases for CDN Performance. What happens under high load, with invalid input, or during failures?
Solution
// Edge case handling:
// 1. Null/empty input -> validation
// 2. High load -> rate limiting, queuing
// 3. Failures -> retries, circuit breaker
// 4. Concurrent access -> locks, idempotency CDN Performance Testing Strategy
Write a testing strategy for CDN Performance. Include unit tests, integration tests, and performance tests.
Solution
// Test plan:
// - Unit: 80% coverage target
// - Integration: API contracts
// - Performance: latency, throughput
// - Chaos: failure injectionQuiz
1. CDN reduces?
2. CDN cache TTL for static assets?
3. What is a common mistake when implementing CDN Performance?
Flashcards
Question
CDN reduces?
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Answer
Latency, server load, DB queries
Question
Static asset TTL?
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Answer
1 year (with versioned filenames)
Question
CDN Performance best practices
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Answer
Follow SOLID principles, write clean code, test thoroughly, document decisions, and monitor in production.
Revision Notes
Key Takeaways
- 1. CDN reduces latency by serving from edge
- 2. Static assets: cache for 1 year
- 3. API responses: short TTL
- 4. Measure: latency reduction, bandwidth savings
Interview Tips
- • Configure CDN caching
- • Measure CDN impact
Cheat Sheet
CDN Performance
- Edge serving: 200ms → 20ms
- Static assets: 1 year TTL
- API responses: minutes TTL
- Benefits: latency, load, bandwidth