What methods do you use to analyze the causes of low service performance?

To analyze the causes of low service performance, I usually use the following approach:

1. Monitoring and metrics collection — I look at CPU load, memory, disk, network, and response time of the service. I use tools like Prometheus, Grafana, New Relic.

2. Profiling — I run profilers (e.g., perf, pprof) to identify bottlenecks in the code or server operation.

3. Logging and tracing — I analyze logs and distributed traces (e.g., Jaeger, Zipkin) to understand where delays occur.

4. Configuration checks — I review server, database, and caching settings to ensure they are optimal.

5. Load testing — Using tools like JMeter or Locust, I test how the service behaves under load.

6. Dependency analysis — I check whether external services or databases are causing delays.

This comprehensive approach helps identify and eliminate causes of low performance.