Rails Performance Review

Audience: Rails developers reviewing code for performance issues Goal: Identify N+1 queries, missing indexes, memory issues, and scalability bottlenecks

Analysis Framework

Check all areas systematically. See references/patterns.yaml for anti-patterns and fixes.

Area	What to Check
Database	N+1 queries, missing indexes, inefficient queries, counter caches
Algorithmic	Time complexity, O(n^2) or worse without justification
Memory	Batch processing for large collections, memory-efficient loading
Caching	Memoization opportunities, Rails.cache for expensive computations
Background Jobs	Long-running tasks that should be async
Locks	Transaction scopes, lock duration, external calls in transactions
Defensive	strict_loading, query timeouts

performance-reviewer

Rails Performance Review

Analysis Framework