Build

Execute all three phases in order.

Phase 1 — Bottleneck

Analyze whichever config file applies:

• Dockerfile
• webpack.config.js / vite.config.ts
• .github/workflows/*.yml

Identify the single step that consumes the most wall-clock time.

Phase 2 — Fix

Docker:

• Reorder layers: least-changing first (OS deps, runtime), most-changing last (app code).
• Use multi-stage builds: compile in a full image, copy only the output artifact into a minimal runtime image (e.g. alpine).

Webpack / Vite:

• Enable code splitting and tree-shaking.
• Enable TerserPlugin with parallel: true.
• Set cache: { type: 'filesystem' } for persistent build caching.

GitHub Actions:

• Cache node_modules using actions/cache keyed on the hash of package-lock.json.
• Cache pip packages keyed on the hash of requirements.txt.
• Add concurrency: groups to cancel in-progress runs on force-push.

Phase 3 — Report

State: "This change will save approximately X minutes per PR run" with explicit reasoning.

| Step | Before | After | Saved | |---|---|---|---| | Dependency install | Xmin | Ymin | Zmin | | Build / compile | Xmin | Ymin | Zmin | | Total pipeline | Xmin | Ymin | Zmin |

Source & license

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

• Author: v0idOS
• Source: v0idOS/performance-deity
• License: MIT
• Homepage: https://v0idos.github.io/performance-deity/

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