.NET Performance Patterns

.NET Performance Patterns

Scan C#/.NET code for performance anti-patterns and produce prioritized findings with concrete fixes. Patterns sourced from the official .NET performance blog series, distilled to customer-actionable guidance.

When to Use

• Reviewing C#/.NET code for performance optimization opportunities
• Auditing hot paths for allocation-heavy or inefficient patterns
• Systematic scan of a codebase for known anti-patterns before release
• Second-opinion analysis after manual performance review

When Not to Use

• Algorithmic complexity analysis — this skill targets API usage patterns, not algorithm design
• Code not on a hot path with no performance requirements — avoid premature optimization

Inputs

Workflow

Step 1: Load Critical Reference

Resolve bundled paths from the directory that contains this SKILL.md, not from the user's workspace. Load this reference file first:

• references/critical-patterns.md

If a direct read fails, list this skill's references/ directory once and retry only when the listing shows the expected file. Do not use workspace file or text search to locate the skill installation.

Step 2: Detect Code Signals and Select Topic Recipes

Scan the code for signals that indicate which pattern categories to check. Use the ## Detection section from the critical reference when available and the inline recipes in Step 3 for initial signal detection.

After detecting signals, load only the topic-specific references selected by scan depth: