Systematically find and fix performance problems in applications, frontend and backend, by measuring first. Use this skill whenever the user reports slow endpoints, high latency, poor throughput, memory leaks, large bundles, or slow page loads; wants to profile with cProfile, py-spy, Chrome DevTools, Node --cpu-prof, or perf; run load tests with locust or k6; set performance budgets or SLOs; optimize database queries (EXPLAIN, indexes, N+1); add caching (Redis); improve frontend performance…
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
Most "slow" problems are diagnosed by guesswork. This skill replaces guessing with a
measure-first workflow: profile, fix minimally, re-measure against a budget. Covers backend
(database, caching, concurrency), frontend (bundles, images, rendering), network (CDN,
compression, HTTP), and memory, with concrete tools and before/after examples.
## Quick Reference
| Topic | Reference |
|-------|-----------|
| Profiling tools per runtime and reading flame graphs | [profiling-tools.md](references/profiling-tools.md) |
| EXPLAIN, index design, N+1 fixes, caching, pooling | [backend-optimization.md](references/backend-optimization.md) |
| Bundles, images, React rendering, Core Web Vitals | [frontend-performance.md](references/frontend-performance.md) |
## Core Workflow
### 1. Measure First
Never optimize before you can answer: *"how do I know it got faster?"*
1. **Reproduce** — get a repeatable trigger (endpoint, page, script, load profile).
2. **Baseline** — record current latency distribution, throughput, and resource usage.
3. **Budget** — set an explicit target (e.g., p95 < 200 ms, initial JS < 170 KB gzipped).
…
The line at the top of this page pins the label git:20260813.4b33420, 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_kbwald7kkgyvweqk
GET https://markdownregistry.com/api/v1/resolve?ref=svngoku/coding-agents-skills/performance-optimization
GET https://markdownregistry.com/api/v1/blob/0ccc15dd66e95899d41c59705f59fc32ff3ec33696ed8d16433468aa056ddb7d
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