Use this skill when optimizing application performance across frontend (Core Web Vitals, bundles), backend (N+1 queries, connection pools, caching), and database (indexes, query plans). Profiles before fixing, pinpoints actual bottlenecks rather than assumed ones, verifies improvements by re-measuring the same way as baseline.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Performance Optimization
Measure before optimizing. Performance work without measurement is guessing — and guessing leads to premature optimization that adds complexity without improving what matters. Profile first, identify the actual bottleneck, fix it, measure again. Optimize only what measurements prove matters.
## When to Use This Skill
Use this skill when:
- Performance requirements exist in the spec (load time budgets, response time SLAs, LCP/INP/CLS targets)
- Users or monitoring report slow behavior (high latency, sluggish interactions, jank)
- Core Web Vitals scores are below 'Good' thresholds
- You suspect a recent change introduced a performance regression
- Building features that handle large datasets or high traffic volumes
- Profiling or tracing reveals a bottleneck that needs addressing
- An N+1 query pattern is discovered in data-fetching code
- Bundle size analysis shows large, unnecessary dependencies
**When NOT to use:** Do not optimize before you have empirical evidence of a problem. Premature optimization is a known source of bugs, complexity, and wasted effort. If you're guessing at what's slow, measure first.
## Core Web Vitals Targets
…
The line at the top of this page pins the label v1.0.0, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
GET https://markdownregistry.com/api/v1/artifacts/art_5uq5ea4plgr6alnu
GET https://markdownregistry.com/api/v1/resolve?ref=jpeetz/agent-skills/performance-optimization
GET https://markdownregistry.com/api/v1/blob/464a4f06b526ed17e18b92dcc39401d8271939110bac94882254c3cb14636ff1
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