Performance Optimization
Load testing, profiling, caching strategies, CDN, database optimization, autoscaling, troubleshooting performance issues
1What is a CDN and what is its main advantage?
What is a CDN and what is its main advantage?
Answer
A CDN (Content Delivery Network) distributes static assets (images, CSS, JS) across servers geographically close to users. This reduces latency (typically from 500ms to 50ms) and offloads the main server. CloudFront (AWS), Cloudflare, and Fastly are common examples used to improve overall web application performance.
2What is the main difference between load testing and stress testing?
What is the main difference between load testing and stress testing?
Answer
Load testing evaluates performance under normal or expected load to verify the system meets SLAs (response time, throughput). Stress testing pushes the system beyond its limits to identify the breaking point and observe behavior under extreme conditions. Stress testing also reveals how the system recovers after overload.
3Which metric is most important for measuring perceived user performance during a load test?
Which metric is most important for measuring perceived user performance during a load test?
Answer
Latency at the 95th or 99th percentile (P95/P99) reflects the experience of the most impacted users, unlike average latency which masks spikes. A P99 of 2 seconds means 99% of requests are faster, but 1% experience slowdowns. Monitoring high percentiles helps identify performance issues before they affect a significant portion of users.
Which profiling tool visualizes function calls and their execution time as a horizontal graph?
What does the acronym RED mean in the context of service monitoring?
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