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SKILL verified Apache-2.0 Self-run

Performance Engineering

skill-hiroqt-pixelcrew-performance-engineering · by hiroqt

Comprehensive guide for full-stack performance engineering across frontend Core Web Vitals (LCP, INP, CLS, TTFB, streaming SSR, priority hints, main thread yielding), backend runtime profiling, multi-tier caching (L1 in-memory, L2 Redis, L3 CDN Edge, XFetch stampede prevention), database query tuning, network transport, automated k6 load & stress testing, and SLA/SLO/SLI error budgets.

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Install

$ agentstack add skill-hiroqt-pixelcrew-performance-engineering

✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.

Security review

✓ Passed

No issues found. Passed automated security review. · v0.1.0 How review works →

  • ✓ Prompt-injection patterns
  • ✓ Secret / credential exfiltration
  • ✓ Dangerous shell & filesystem operations
  • ✓ Untrusted network calls
  • ✓ Known-malicious package signatures

What it can access

  • ✓ Network access No
  • ✓ Filesystem access No
  • ✓ Shell / process execution No
  • ✓ Environment & secrets No
  • ✓ Dynamic code execution No

From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.

View the full security report →

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Reliability & compatibility

✓ Security review passed
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● 22d ago

Declared compatibility

Claude CodeClaude Desktop

Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.

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About

Performance Engineering & Production Readiness

This skill provides comprehensive instructions, diagnostic runbooks, optimization formulas, load testing scripts, and production verification checklists to guarantee high system performance, reliability, and smooth operations at scale.

1. Core Engineering Directives

  1. Frontend Core Web Vitals (CWV) Targets:
  • LCP (Largest Contentful Paint) < 2.5s: Apply fetchpriority="high" on hero images, preload critical web fonts with font-display: swap, and eliminate render-blocking stylesheets.
  • INP (Interaction to Next Paint) < 200ms: Yield long tasks to the browser main thread using scheduler.yield() or requestIdleCallback(); offload heavy parsing to Web Workers.
  • CLS (Cumulative Layout Shift) < 0.1: Set explicit aspect-ratio / width & height on all media; use @font-face size-adjust to match fallback font metrics.
  • TTFB (Time to First Byte) < 800ms: Deploy edge computing (V8 isolates), streaming SSR, and HTTP 103 Early Hints.
  1. Backend & Runtime Optimization:
  • Monitor and profile Event Loop Utilization (ELU) in Node.js, CPU/memory profiles via pprof in Go/Rust, and tune JVM garbage collection (ZGC/Shenandoah).
  • Detect and eradicate memory leaks using automated heap snapshot comparisons.
  1. Multi-Tier Caching & Stampede Prevention:
  • Implement hierarchical caching: L1 (Process memory LRU) $\to$ L2 (Distributed Redis cluster) $\to$ L3 (CDN Edge).
  • Eliminate Thundering Herd / Cache Stampedes using the XFetch Probabilistic Early Expiration algorithm or Singleflight / Mutex locks.
  • Configure precise HTTP Cache-Control headers (public, max-age=31536000, immutable, stale-while-revalidate, stale-if-error).
  1. Data Layer & Transport Performance:
  • Eliminate N+1 queries with batched DataLoaders and SQL lateral joins.
  • Size connection pools using Little's Law to prevent connection starvation under high concurrency.
  • Profile slow queries using pg_stat_statements.
  1. Production Readiness & Stress Testing:
  • Run automated k6 load test pipelines (Smoke tests, Load tests, Stress tests, Spike tests, and 24-hour Soak tests).
  • Establish formal SLIs, SLOs, and Error Budgets tied to the Four Golden Signals (Latency, Traffic, Errors, Saturation).
  • Execute the 50+ item Pre-Production Go-Live Verification Checklist before deploying to production.

2. Quick Navigation & Reference Modules

  • [Core Web Vitals & Frontend Performance Guide](./references/full-stack-optimization-guide.md)
  • [Backend Runtime Profiling & Memory Leak Hunting](./references/backend-and-runtime-optimization.md)
  • [Multi-Tier Caching & Database Performance Guide](./references/caching-and-database-perf.md)
  • [k6 Load & Stress Testing Script Templates](./references/load-testing-k6-templates.md)
  • [Pre-Production Go-Live Verification Checklist](./references/production-readiness-checklist.md)

Source & license

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

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

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Versions

  • v0.1.0 Imported from the upstream source.

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