performance SKILL.md skillA

performance from tomcounsell/ai is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add tomcounsell/ai/performance@git:20261027.b1054fc

Pins git:20261027.b1054fc in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: tomcounsell/ai
Path: skills/valor/bama/skills/code/performance/SKILL.md
Versions recorded: 1
Latest version: git:20261027.b1054fc, committed Oct 27, 2026
Size: 3,682 bytes
Repository stars: 31
License: GPL-3.0

Make a macOS app fast by measuring hangs, stutter, CPU, memory, and energy, then moving work off the main thread and onto the GPU. Use when the app freezes, a shortcut feels slow, dragging stutters, the fan spins, memory grows, or the user asks to optimize or profile.

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

Fast means two numbers: the first frame after a key press shows in under
100 ms, and nothing on the main thread blocks for more than 50 ms. Every
change in this skill starts and ends with a **measurement**, so you know it
helped. Symptom-by-symptom fixes are in [recipes.md](recipes.md). For
video, audio, camera, Metal, or large image pipelines, also read
[gpu-media.md](gpu-media.md).

## The loop

```text
reproduce -> measure (release build) -> find the line -> fix -> measure again -> commit with the numbers
```

1. **Reproduce.** Write the exact steps, or add a probe command to the
   debug bridge (`test-mac-app` skill) that runs the slow action and logs
   the time of each step.
2. **Measure the release build.** Debug Swift is 3 to 10 times slower and
   points at the wrong code.
3. **Find the line.** Pick the tool for the symptom:

   | Symptom | Tool |
   | --- | --- |
   | App freezes, spinning pointer | `sample <App> 5`, then read the main thread stack |
   | Slow action | Time Profiler: `xcrun xctrace record --template 'Time Profiler' --attach <App> --time-limit 10s` |
   | Short freezes while typing or dragging | `--template 'Hangs'` |
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add tomcounsell/ai/performance@sha256:62196ebe46a42028

The line at the top of this page pins the label git:20261027.b1054fc, 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.

Badge

[![mdr](https://markdownregistry.com/badge/art_uhautmygzw77cz7o.svg)](https://markdownregistry.com/a/art_uhautmygzw77cz7o)

2 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 1 version of this file, committed on Oct 27, 2026.

version	committed	commit	size	audit
git:20261027.b1054fc latest	2026-10-27	b1054fc	3,682 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (3682 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

GitHub

tomcounsell/ai · 31 stars · license GPL-3.0 · pushed 2026-11-01 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_uhautmygzw77cz7o
GET https://markdownregistry.com/api/v1/resolve?ref=tomcounsell/ai/performance
GET https://markdownregistry.com/api/v1/blob/62196ebe46a42028826cd679a6ae588bd368ad4965560976821241f2be34aa05

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.

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