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developer-performance-instincts (Grade A)Security-tested data-ai skill for Claude AI. Grade A. PERFORMANCE INSTINCTS — extracted from roles.json deepPrompt for developer

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Daniel NikulshynReviewed by Daniel Nikulshyn·Updated July 2026

Overview

This skill encodes a behavioral procedure originally embedded in the developer role's deepPrompt. It provides a set of best practices for improving and troubleshooting the performance of web applications. The skill advises developers to 'Measure First: Never guess at performance. Profile in production or with production-representative data' and to use tools such as console.log timing and Chrome DevTools performance tab to identify performance issues. It also covers Big-O Awareness, emphasizing the importance of understanding the complexity of data structures and the potential performance implications of certain algorithms. Additionally, it provides guidance on Database Performance, Caching, and Frontend Performance, including strategies for optimizing query plans, using indexes, batching operations, and lazy-loading routes and heavy components. The skill encourages developers to follow these best practices to ensure the optimal performance of their web applications and to avoid potential pitfalls such as O(n²) complexity in loops over user data or N+1 queries. It also advises on the usage of connection pooling, caching layers, and HTTP cache headers to improve performance and reduce staleness problems.

Key features

  • Performance measurement guidelines
  • Big-O awareness
  • Database performance optimization
  • Caching strategies
  • Frontend performance metrics and optimization

Pricing

Model
Free
Category
Skills
Rating
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Use cases

Improving Application Performance

Use this skill to identify and address performance bottlenecks in an application, ensuring a better user experience.

Optimizing Database Queries

Apply the skill's guidelines on database performance, including indexing and query planning, to improve database efficiency.

Enhancing Frontend User Experience

Utilize the skill's advice on frontend performance metrics, such as Largest Contentful Paint and Time to Interactive, to optimize the user interface.

Pros & Cons

Pros

  • Provides actionable performance guidelines for developers
  • Emphasizes the importance of data structure complexity awareness
  • Covers a range of performance topics from measurement to frontend optimization

Cons

  • May be too verbose or overwhelming for some developers
  • Does not provide specific implementation details or examples

Reviews

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Q&A

Which local models should I run, and how does hardware affect SecureContext?

SecureContext degrades gracefully by hardware tier — every LLM‑powered layer fails closed (the feature quietly contributes nothing) rather than breaking ingest or search. What changes with hardware is how much of the intelligence stack is active: | Tier | Hardware | Models that fit | What you get | |---|---|---|---| | Minimum | Any CPU, ~2 GB RAM free | nomic-embed-text (embeddings only) | Hybrid BM25+vector search, working memory, audit chain, skills gating — the core. LLM layers (event extraction, entity extraction, contradiction adjudication) stay dormant. | | Mid | 8–16 GB GPU (or Apple Silicon 16 GB+) | + qwen2.5-coder:14b or phi4:14b (one at a time) | + Event‑fact extraction at ingest (temporal reasoning), LLM contradiction adjudication, entity extraction, L0/L1 semantic file summaries. | | Full | 24 GB+ GPU (e.g. RTX 4090/5090) | + phi4:14b and gpt‑oss:20b resident together | Everything, concurrently, at interactive latency — plus a strong local generator for QA/benchmarks. This is the configuration our published benchmark deltas were measured on. Model‑choice guidance (all measured, see bench/): Embeddings: nomic-embed-text — required, tiny, runs anywhere. Event extraction (ZCEVENTEXTRACTMODEL, default phi4:14b): our bakeoff scored phi4:14b at 100% event recall / 100% date accuracy, tying gpt‑oss:20b at 2× the speed. On smaller GPUs qwen2.5-coder:14b is close behind (84.6% recall). Coder models ≠ better: qwen2.5-coder:32b scored worst (69.2%) despite being the large

Asked by Olamide Fashola · Jan 9, 2026

What do I need to run it?

Node 20+ and (recommended) Docker for the bundled PostgreSQL + Ollama stack. The one‑command installer does everything in about five minutes. A SQLite fallback runs with zero infrastructure.

Asked by Victor Nguyen · Jan 5, 2026

Can multiple Claude Code sessions work on the same project without conflicts?

Yes — parallel sessions atomically claim tasks from a work‑stealing queue (zero double‑claims at 50 agents × 100 tasks in testing), coordinate through typed broadcasts (ASSIGN/STATUS/MERGE/REJECT), and keep private per‑agent memory namespaces plus a shared pool. Department‑style hierarchies (heads + workers, N‑tier escalation) are supported for larger agent teams.

Asked by Mateusz Wozniak · Nov 19, 2025

Are Claude Code skills safe to install?

Filesystem skills bundle scripts that run with your permissions, and Claude Code's native loader does not scan them. SecureContext adds the missing gate: AST scan at admission, HMAC verification before every execution, automatic quarantine on failure or post‑admission change, and a verifiable chained log of every admission decision.

Asked by Gabriel Duarte · Nov 18, 2025

Does SecureContext send my code or data to the cloud?

No. Memory, embeddings (Ollama nomic-embed-text), search, summarization, and the audit chain all run locally. It works fully offline (search degrades gracefully to keyword‑only if Ollama is down) and costs $0 when idle.

Asked by Kwesi Boateng · Nov 16, 2025

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