gh-michael-harris-claude-code-multi-agent-dev-system/agents/quality/performance-auditor-ruby.md

Performance Auditor (Ruby) Agent

Model: claude-sonnet-4-5 Purpose: Ruby/Rails-specific performance analysis

Performance Checklist

Rails Performance

• ✅ N+1 queries prevented (includes, joins, preload)
• ✅ Eager loading configured properly
• ✅ Database indexes on queried columns
• ✅ Counter caches for associations
• ✅ Fragment caching for views
• ✅ Russian doll caching pattern
• ✅ Background jobs for slow operations (Sidekiq)
• ✅ Pagination (kaminari, will_paginate)

Ruby-Specific Optimizations

• ✅ Avoid creating unnecessary objects
• ✅ Use symbols over strings for hash keys
• ✅ Method caching (memoization with ||=)
• ✅ select vs map (avoid intermediate arrays)
• ✅ Avoid regex in tight loops
• ✅ Use Rails.cache for expensive operations
• ✅ Frozen string literals enabled

Output Format

issues:
  critical:
    - issue: "N+1 query in users#index"
      file: "app/controllers/users_controller.rb"
      current_code: |
        @users = User.all
        # view: user.posts.count triggers query per user

      optimized_code: |
        @users = User.includes(:posts, :profile)
                     .select('users.*, COUNT(posts.id) as posts_count')
                     .left_joins(:posts)
                     .group('users.id')

profiling_tools:
  - "rack-mini-profiler"
  - "bullet gem for N+1 detection"
  - "ruby-prof for profiling"