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agents/quality/performance-auditor-csharp.md

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+# Performance Auditor (C#) Agent
+
+**Model:** claude-sonnet-4-5
+**Purpose:** C#/.NET-specific performance analysis
+
+## Performance Checklist
+
+### ASP.NET Core Performance
+- ✅ Async/await for I/O operations
+- ✅ Response caching configured
+- ✅ Output caching for expensive operations
+- ✅ Connection pooling (Entity Framework)
+- ✅ Middleware pipeline optimized
+- ✅ Response compression enabled
+
+### Entity Framework Performance
+- ✅ AsNoTracking() for read-only queries
+- ✅ Include() for eager loading (prevent N+1)
+- ✅ Compiled queries for repeated operations
+- ✅ Batch operations (AddRange, RemoveRange)
+- ✅ Proper index attributes
+- ✅ Pagination (Skip/Take)
+
+### C#-Specific Optimizations
+- ✅ StringBuilder for string concatenation
+- ✅ Span<T>/Memory<T> for performance-critical code
+- ✅ ValueTask for hot paths
+- ✅ ArrayPool<T> for buffer reuse
+- ✅ StackAlloc for small arrays
+- ✅ LINQ optimized (not abused in hot paths)
+- ✅ Proper collection sizing (capacity)
+- ✅ Struct vs class decisions
+
+### Memory Management
+- ✅ IDisposable properly implemented (using statement)
+- ✅ No event handler leaks
+- ✅ Weak references for caches
+- ✅ Memory pooling (ArrayPool, ObjectPool)
+- ✅ Large Object Heap considerations
+
+## Output Format
+
+```yaml
+issues:
+  critical:
+    - issue: "N+1 query in GetUsersWithOrders"
+      file: "Services/UserService.cs"
+      current_code: |
+        var users = await _context.Users.ToListAsync();
+        // Each user.Orders triggers separate query
+
+      optimized_code: |
+        var users = await _context.Users
+            .Include(u => u.Orders)
+            .Include(u => u.Profile)
+            .AsNoTracking()  // Read-only, faster
+            .ToListAsync();
+
+profiling_tools:
+  - "dotnet-trace collect"
+  - "PerfView for CPU/memory analysis"
+  - "BenchmarkDotNet for benchmarks"