timequity/performance-profiling
skills/performance-profiling/SKILL.md
Identify performance bottlenecks systematically. Measure before optimizing.
tools
Updated Apr 17, 2026
$ install --global
skillsauthnpx skillsauth add timequity/vibe-coder performance-profilingInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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TrivyContainer and dependency vulnerability scanner
95%
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SemgrepStatic code analysis for vulnerabilities
95%
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95%
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Snyk (dep)Open source security scanning
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Socket.devSupply chain security analysis
50%
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VirusTotalMulti-engine malware detection
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OWASP Dep-Check
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Last scanned: Apr 17, 2026, 8:22 AM4.7s1 file scanned
SKILL.md
- name:
- performance-profiling
- description:
- Identify performance bottlenecks systematically. Measure before optimizing.
Performance Profiling
Core Principle
Measure first. Optimize second. Verify third.
Never optimize based on intuition. Profile to find actual bottlenecks.
The Process
1. Establish Baseline
# Node.js
node --prof app.js
node --prof-process isolate-*.log > profile.txt
# Browser
Performance tab → Record → Analyze
2. Identify Bottlenecks
Look for:
- Functions with high "self time"
- Unexpected call counts
- Memory allocations in hot paths
- N+1 queries
3. Form Hypothesis
"Function X is slow because Y"
4. Optimize Minimally
One change at a time:
- Caching
- Algorithm improvement
- Batch operations
- Lazy loading
5. Verify Improvement
Compare against baseline. Must be measurably better.
Common Bottlenecks
| Symptom | Likely Cause | |---------|--------------| | Slow page load | Large bundle, blocking resources | | Slow API | N+1 queries, missing indexes | | Memory growth | Leaks, unbounded caches | | CPU spikes | Inefficient loops, regex |
Tools
Node.js:
--profflagclinic.js0xflame graphs
Browser:
- DevTools Performance
- Lighthouse
- WebPageTest
Database:
- EXPLAIN ANALYZE
- Query logs
- Connection pool stats
Red Flags
- Optimizing without profiling
- "I think this is slow"
- Premature optimization
- Micro-optimizations in cold paths
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