# Performance Profiler > Application performance profiling - runtime snapshots, benchmarking, memory analysis, startup timing, and bottleneck detection - Skill: `chainlesschain/performance-profiler` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add chainlesschain/performance-profiler` - Raw SKILL.md: https://api.skillmd.com/api/skills/chainlesschain/performance-profiler/raw - Safety review: pending - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Web & Frontend - Author: chainlesschain (https://skillmd.com/u/chainlesschain) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/chainlesschain/performance-profiler --- # Performance Profiler Application performance profiling skill using Node.js built-in APIs. ## Features | Action | Command | Description | | --------- | ---------------------------------------- | -------------------------------------------- | | Snapshot | `--snapshot` | Capture current process performance snapshot | | Benchmark | `--benchmark [--runs N]` | Run a command N times, measure timing stats | | Memory | `--memory` | Detailed memory analysis with growth trend | | Startup | `--startup ` | Measure cold startup time of a command | | Compare | `--compare ` | Compare two saved snapshot JSON files | | Profile | `--profile [--duration ]` | Profile a Node.js script execution | | Report | `--report [--output ]` | Generate comprehensive performance report | | (default) | (no flags) | Same as --snapshot | ## Output - All timing in milliseconds or seconds as appropriate - Memory sizes in human-readable format (MB/GB) - Benchmark statistics include avg, min, max, and standard deviation - Snapshot comparison shows absolute and percentage deltas