# perf

Skill · `skill:perf`

Favz census, built 2026-10-02. Tool names and counts only. No repo names. HTML page: https://favz.co/tools/skill-perf.html

- Repos that have it now: 20
- Repos that ever had it: 21
- Still have it: 95%
- Share of census repos with any tool: 0.04%

## Repos with it, by month

From commit dates in each repo's history. The last few days always look low, because repos found later fill them in.

| Month | Repos at month end |
|---|---|
| 2026-02 | 2 |
| 2026-03 | 9 |
| 2026-04 | 15 |
| 2026-05 | 17 |
| 2026-06 | 16 |
| 2026-07 | 17 |
| 2026-08 | 19 |
| 2026-09 | 20 |

## Goes with

Tools found in the same repos, ranked by lift: 3× means the two show up together three times as often as chance would give. Only pairs sharing 5 or more repos.

| Tool | Kind | Repos with both | Lift |
|---|---|---|---|
| [migrate](https://favz.co/tools/skill-migrate.md) | Skill | 6 | 346.4× |
| [docs](https://favz.co/tools/skill-docs.md) | Skill | 9 | 216.1× |
| [refactor](https://favz.co/tools/skill-refactor.md) | Skill | 11 | 187.8× |
| [architect](https://favz.co/tools/skill-architect.md) | Skill | 5 | 178.3× |
| [debug](https://favz.co/tools/skill-debug.md) | Skill | 7 | 120.4× |
| [accessibility](https://favz.co/tools/skill-accessibility.md) | Skill | 5 | 114.4× |
| [api-design](https://favz.co/tools/skill-api-design.md) | Skill | 6 | 99.0× |
| [security-audit](https://favz.co/tools/skill-security-audit.md) | Skill | 5 | 72.2× |
| [research](https://favz.co/tools/skill-research.md) | Skill | 10 | 71.3× |
| [test](https://favz.co/tools/skill-test.md) | Skill | 8 | 69.0× |
| [review](https://favz.co/tools/skill-review.md) | Skill | 11 | 66.0× |
| [deploy](https://favz.co/tools/skill-deploy.md) | Skill | 6 | 52.3× |