Skill: frontend/performance-pass-ui

Purpose

Improve UI performance by removing obvious regressions and hotspots:

• unnecessary rerenders
• expensive derived computations on render
• unbounded lists or heavy DOM
• avoidable bundle bloat and lazy-load misses

This is a focused pass. It should not change user-facing behavior.

Inputs

• Target UI surface (route/component)
• Reported symptom (slow render, jank, laggy typing, long TTI) if known
• Repo profile (preferred): <repo>/REPO_PROFILE.json (framework/tooling/commands)
• Existing instrumentation (React DevTools Profiler, performance marks, logs) if present