What problem does it solve? Applications slow down for reasons that are hard to pin down: wasted re-renders, slow database queries, memory leaks, or bloated bundles. This Skill performs structured performance audits that identify root causes with profiling evidence and deliver prioritized, actionable fixes instead of guesswork. ## Core Features & Use Cases - Cross-Stack Profiling: Analyzes frontend rendering, backend CPU and query performance, and mobile resource usage using the project's own platform tooling. - Root Cause Analysis: Distinguishes CPU-bound, I/O-bound, and memory-bound issues with stack traces, flame graphs, and query execution plans. - Prioritized Report: Produces a Markdown performance report with quantified impact, before/after code examples, and fixes ranked by measured impact versus risk. - Use Case: During Phase 4 of an Archflow project, delegate a slow API endpoint to this role; it profiles p95 latency, finds an N+1 query pattern, and writes a report with the optimized query and expected improvement. ## Quick Start Ask the agent to profile the current application's performance bottlenecks and write a performance report with prioritized optimization recommendations.