performance-pass SKILL.md skillA
performance-pass from ham7a311/vitrine is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add ham7a311/vitrine/performance-pass@git:20261004.15312e4Pins git:20261004.15312e4 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- ham7a311/vitrine
- Path
src/workshop/skills/performance-pass/SKILL.md- Versions recorded
- 1
- Latest version
- git:20261004.15312e4, committed Oct 4, 2026
- Size
- 10,144 bytes
- Repository stars
- 10
- License
- MIT
Measure and fix how fast a site loads and responds on a mid-range phone - LCP, CLS, total blocking time, bytes by type, oversized images, font weight - with a Playwright script that throttles CPU and network, then fix the causes in order of impact and re-measure. Covers animated canvases and WebGL backgrounds, which must pause offscreen and fall back on weak devices. Use before launch, when a page feels slow on a phone, or after adding heavy visuals.
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-pass A page is fast when the thing you came for appears quickly, stays where it is, and responds when you touch it. Measure those three things on a phone-class device, fix the biggest cause, and measure again. | Metric | What it answers | Good | Needs work | |---|---|---|---| | **LCP** (Largest Contentful Paint) | When did the main content appear? | ≤ 2.5 s | ≤ 4 s | | **CLS** (Cumulative Layout Shift) | Did things jump while I was reading? | ≤ 0.1 | ≤ 0.25 | | **TBT** (Total Blocking Time) | Was the page frozen while loading? (Stands in for INP in a lab.) | ≤ 200 ms | ≤ 600 ms | ## 1. Measure a production build Development servers ship unminified code and inflate every number, so build and serve the site first: ``` npm run build && npm run start ``` Save this as `perf.mjs` in a scratch directory (it needs `playwright`) and run it: ``` node perf.mjs http://localhost:3000 / /pricing /blog/some-post ``` Each page is loaded as a 390px-wide phone at 2x density, with the CPU slowed 4x and a fast-4G network. The script scrolls through the page once, then reports: - LCP and its element, CLS and TBT - transfer size by type, and the five heaviest requests …
Read the whole file at its exact version.
How to install
mdr add ham7a311/vitrine/performance-pass@sha256:b34044003dfb3b57The line at the top of this page pins the label git:20261004.15312e4, 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_hcgb22gjmzkiovhi)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Oct 4, 2026.
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 (10144 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
ham7a311/vitrine · 10 stars · license MIT · pushed 2026-10-15 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_hcgb22gjmzkiovhi GET https://markdownregistry.com/api/v1/resolve?ref=ham7a311/vitrine/performance-pass GET https://markdownregistry.com/api/v1/blob/b34044003dfb3b571409f36584cfbcf26d43a4187d916806d65399515ec04fc6
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.