# Performance Craft

> Design that holds its frame rate — because janky motion is failed design, not a separate engineering concern. Per-platform rendering discipline: compositor-friendly CSS and GPU layers on the web; ProMotion/adaptive-refresh timing, Metal particle/overdraw budgets, and efficiency-core scheduling on Apple platforms; draw-call and fill-rate budgets in game engines. Includes the graceful-degradation l…

- **Type:** Skill
- **Install:** `agentstack add skill-jangles-byte-atelier-performance-craft`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [jangles-byte](https://agentstack.voostack.com/s/jangles-byte)
- **Installs:** 0
- **Category:** [Agent Skills](https://agentstack.voostack.com/c/agent-skills)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [jangles-byte](https://github.com/jangles-byte)
- **Source:** https://github.com/jangles-byte/atelier/tree/main/skills/performance-craft

## Install

```sh
agentstack add skill-jangles-byte-atelier-performance-craft
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# Performance Craft

A dropped frame is a design defect the user feels before they can name it. This
skill treats the frame budget as a design material: know the budget, spend it on
what the philosophy values, and degrade in the order that does the least visual
damage.

## The budget

Frame time = 1000 / refresh rate: **8.3ms at 120Hz, 16.6ms at 60Hz** — minus the
platform's own compositing overhead. Design for the *display the audience has*:
ProMotion phones and most gaming displays are 120Hz; never hardcode 60. Measure
before and after any motion work — profilers, not vibes (DevTools Performance /
Instruments' Animation Hitches / engine profilers).

## Which reference to load

| Situation | Load |
|---|---|
| Web: CSS/JS/canvas/WebGL animation, scroll jank, layout thrash | `references/web-rendering.md` |
| Apple: SwiftUI/UIKit hitches, Metal, ProMotion, battery/thermals | `references/apple-silicon.md` |
| Game engines, particles at scale, and the degradation ladder | `references/budgets-and-degradation.md` |

## Non-negotiables

- Animate compositor-friendly properties (transform, opacity — and their platform
  equivalents) unless a measured reason says otherwise.
- Timing from delta-time or the platform's frame callback, never a hardcoded
  1/60 assumption.
- Always-on ambient animation must be provably cheap: paused off-screen, GPU-only,
  and off the performance cores / not preventing CPU idle.
- `prefers-reduced-motion` (and platform equivalents) is also the low-power path —
  wire them together.
- When the budget is blown, cut by the degradation ladder — never ship the stutter,
  and never fix it by cutting the design's primary feedback motion first.

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [jangles-byte](https://github.com/jangles-byte)
- **Source:** [jangles-byte/atelier](https://github.com/jangles-byte/atelier)
- **License:** MIT

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-jangles-byte-atelier-performance-craft
- Seller: https://agentstack.voostack.com/s/jangles-byte
- Browse the marketplace: https://agentstack.voostack.com/browse

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Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.