swift-performance-analyzer

Scans Swift code for performance issues — from known anti-patterns like unnecessary copies and ARC overhead to context-dependent problems like actor hops in tight loops and existential types in hot paths.

What It Does

• Detects 8 known anti-patterns (unnecessary copies, ARC traffic, unspecialized generics, collection inefficiencies, actor overhead, large value types, inlining, memory layout)
• Identifies context-dependent performance issues (same code is acceptable in setup but devastating in a tight loop)
• Correlates findings that compound into higher severity
• Produces a Performance Health Score (OPTIMIZED / OVERHEAD / BOTTLENECKED)

Note: This agent checks Swift-level performance (ARC, copies, generics, actors). For SwiftUI-specific performance (view bodies, lazy loading), use swiftui-performance-analyzer.

How to Use

Natural language:

• "Check my Swift code for performance issues"
• "Audit my code for optimization opportunities"
• "I'm seeing excessive memory allocations"

Explicit command:

/axiom:audit swift-performance

Related

• swift-performance skill — use to profile and fix the issues this auditor finds
• swiftui-performance-analyzer agent — for SwiftUI view-specific performance (complementary)
• memory-auditor agent — overlaps on ARC and closure capture lifecycle
• concurrency-auditor agent — overlaps on actor isolation overhead