[Analysis Layer] Performance Pattern Detection #7

Activity

1. gloomcheng

   added this to the v1.0 - AI-Native Development Platform milestone on Dec 25, 2025
2. gloomcheng

   added

   enhancementNew feature or requestNew feature or request

   priority:mediumMedium priority itemMedium priority item

   layer:analysisAnalysis Layer - static analysis & impactAnalysis Layer - static analysis & impact

   on Dec 25, 2025
3. gloomcheng commented on Dec 25, 2025

   

   gloomcheng

   on Dec 25, 2025

   ContributorAuthor

   More actions

   ✅ Issue #7 Completed: Performance Pattern Detection

   Successfully implemented static performance anti-pattern detection system.

   What was implemented:

   1. PerformanceAnalyzer Service - Pattern-based performance analysis

      • 16 built-in anti-pattern detection rules
      • Regex-based matching with context awareness
      • Configurable severity levels (info/warning/error)
      • Custom pattern support via config file or API
      • Pattern categories: database, async, memory, rendering, computation, io, resource-leak

   2. PerformanceAnalysisHandler - MCP tool interface

      • 5 new MCP tools: performance-analyze, performance-list-patterns, performance-add-pattern, performance-disable-pattern, performance-enable-pattern
      • Detailed reporting grouped by category and severity
      • Pattern management and customization

   3. Built-in Pattern Detection - Comprehensive coverage

      • Database: N+1 queries in loops, sequential awaits
      • React/Rendering: Missing dependency arrays, missing cleanup, inline functions, missing list keys
      • Async/Await: Sync I/O in async context, unhandled promises
      • Memory: Inefficient array operations, JSON.parse in loops
      • Resource Leaks: Unclosed connections, missing event listener cleanup
      • Blocking: Sync crypto operations, catastrophic regex backtracking

   Integration:

   • Fully integrated with ImplementationValidator
   • Runs automatically as 4th priority validation check
   • Critical performance issues block implementation completion
   • Warnings provide actionable optimization suggestions

   Customization Features:

   • Add project-specific patterns via MCP tool or .cortex/performance.json
   • Disable noisy patterns without removing them
   • Override severity levels per pattern
   • File pattern matching for targeted analysis (e.g., only *.tsx files)
   • Context-aware matching (e.g., only flag in loops)

   Example Patterns Detected:

   // N+1 Query (ERROR)
   for (const user of users) {
     await db.findOne({ id: user.id }); // 🚨 Database query in loop
   }
   
   // Missing Cleanup (ERROR)
   useEffect(() => {
     window.addEventListener('resize', handleResize);
     // ❌ No cleanup function!
   }, []);
   
   // Inline Function (INFO)
   <Button onClick={() => console.log('click')} /> // ℹ️ Creates new function on every render

   Validation Flow:

   1. Danger Zones → 2. Environment → 3. Dependencies → 4. Performance → 5. Mocks → 6. Unused Code

   This completes the second Analysis Layer feature, giving AI the ability to:

   • Detect performance anti-patterns without running code ✅
   • Provide context-aware optimization suggestions ✅
   • Learn project-specific performance requirements ✅

   Committed in: 0dc2e9d
4. gloomcheng

   closed this as completedon Dec 25, 2025
5. gloomcheng

   added a commit that references this issue on Dec 25, 2025

   feat: add performance anti-pattern detection and analysis (Issue #7)

   ...

   0dc2e9d