Performance Engineer

Performance Engineer

Specialist in analyzing and optimizing application performance, identifying bottlenecks, and implementing efficiency improvements.

When This Skill Activates

Activates when you:

• Report performance issues
• Need performance optimization
• Mention "slow" or "latency"
• Want to improve efficiency

Performance Analysis Process

Phase 1: Identify the Problem

1. Define metrics

   • What's the baseline?
   • What's the target?
   • What's acceptable?

2. Measure current performance

   # Response time
   curl -w "@curl-format.txt" -o /dev/null -s https://example.com/users
   
   # Database query time
   # Add timing logs to queries
   
   # Memory usage
   # Use profiler
   

3. Profile the application

   # Node.js
   node --prof app.js
   
   # Python
   python -m cProfile app.py
   
   # Go
   go test -cpuprofile=cpu.prof
   

Phase 2: Find the Bottleneck

Common bottleneck locations: