# Eng Performance

> Guard latency, memory, battery, bandwidth, and gas/compute budgets by measuring before and after every change.

- Skill: `tjboudreaux/eng-performance` (Agent Skill)
- Install (CLI): `npx skillmds@latest add tjboudreaux/eng-performance`
- Raw SKILL.md: https://api.skillmd.com/api/skills/tjboudreaux/eng-performance/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: tjboudreaux (https://skillmd.com/u/tjboudreaux)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/tjboudreaux/eng-performance

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# Performance and Efficiency Awareness

## Intent
- Treat budgets (frame time, network round-trips, server CPU, on-chain gas) as first-class requirements.
- Prevent regressions by profiling early, not after user complaints.

## Inputs
1. Existing SLAs/budgets per platform (FPS, TTI, API latency, contract gas caps).
2. Representative workloads, datasets, replays, or load scripts.
3. Tooling: profilers, flamegraphs, shader analyzers, gas estimators, Lighthouse, etc.

## Workflow
1. **Establish baseline**
   - Capture metrics for the current implementation under realistic load/device tiers.
2. **Design with budgets**
   - Choose data structures, rendering strategies, and contract patterns aligned with constraints.
   - Consider caching, pagination, batching, and compression aggressively.
3. **Measure iteratively**
   - After each significant change, run targeted benchmarks or simulations.
   - Track results in the PR/issue; highlight deltas and why they are acceptable.
4. **Optimize where it matters**
   - Focus on user-facing bottlenecks; avoid premature micro-optimizations.
   - For web3, minimize storage writes and external calls; for mobile, monitor battery/thermal impact.

## Verification
- Benchmarks or profiling output attached, showing no regression (or justified improvements).
- Budgets documented; alarms/alerts configured if applicable.
- For regressions that cannot be fixed immediately, open a follow-up issue with owner, impact, and mitigation.