Performance Profiling Skill

Load testing says "it's slow." Profiling tells you why. This skill covers profiling workflows for CPU, memory, and latency across languages — from running the profiler to reading the flamegraph.

When to Activate

• A service is slower than its SLO and the cause is unknown
• Post-load-test: numbers are bad, now find the bottleneck
• Reviewing a pull request that touches hot code paths
• Investigating memory growth over time (leak detection)
• Optimizing before a traffic spike

CPU Profiling

Go — pprof (built-in, zero setup)