performance SKILL.md skillA
performance from ericrisco/rsc-harness is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add ericrisco/rsc-harness/performance@git:20260806.2c14dfbPins git:20260806.2c14dfb in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- ericrisco/rsc-harness
- Path
skills/performance/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260806.2c14dfb, committed Aug 6, 2026
- First version recorded
- Jun 2, 2026
- Size
- 16,168 bytes
- Repository stars
- 236
- License
- MIT
Use when a page or interaction is slow for one user and the fix starts from a measurement — a failing Core Web Vital (LCP, INP, CLS), a heavy JS bundle, wasted re-renders, an over-broad client boundary: profile, attribute the cost to one phase, fix it, re-measure. NOT surviving concurrent load (that is `scaling`), NOT the slow query (that is `postgresdb`).
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: make one thing fast Performance makes a single request, page, or interaction faster for one user. Scaling makes many requests survive at the same time. Different problem, different toolbox — if the system is fine for you and only bends under concurrent load, that is `../scaling/SKILL.md`, not this. The whole job in one line: **measure with a profiler → attribute the cost to one specific phase → apply the one fix that moves that phase → re-measure against a number.** Repeat until you clear the threshold, then stop. **Prime directive: no fix without a profile first.** A waterfall, a flame chart, a bundle treemap, or a field CWV number comes before you touch code. The fix you guess is almost never the fix the measurement points at, and a "fast" change that moves a phase nobody was waiting on is wasted work that you then have to maintain. Cross-reference, don't duplicate: the last column of the table below names where each deep fix lives. The one case it has no row for — you decided *what* to cache to cut a phase and now need that cache race-free — is `../redis/SKILL.md`. ## Decision table — symptom to first move …
Read the whole file at its exact version.
How to install
mdr add ericrisco/rsc-harness/performance@sha256:ffbdecc1e4534a37The line at the top of this page pins the label git:20260806.2c14dfb, 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.
[](https://markdownregistry.com/a/art_2qq3we6jdlaot7zm)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Jun 2, 2026 and Aug 6, 2026, about one every 33 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260806.2c14dfb latest | 2026-08-06 | 2c14dfb | 16,168 B | A | view · diff |
| git:20260729.b288105 | 2026-07-29 | b288105 | 14,775 B | A | view · diff |
| git:20260602.75f7184 | 2026-06-02 | 75f7184 | 15,491 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (16168 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
ericrisco/rsc-harness · 236 stars · license MIT · pushed 2026-10-21 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_2qq3we6jdlaot7zm GET https://markdownregistry.com/api/v1/resolve?ref=ericrisco/rsc-harness/performance GET https://markdownregistry.com/api/v1/blob/ffbdecc1e4534a37ceafed9eac58976cc1d1c6cd6036a72cebde8aed51ef5d50
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
More from ericrisco/rsc-harness
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