Optimizing Rails Applications

Rails is a powerful framework, but performance optimization is crucial at scale.

N+1 Query Problems

The classic N+1 problem occurs when you load parent records and then query for each child in a loop.

# Bad
users = User.all
users.each { |user| puts user.posts.count }

# Good
users = User.includes(:posts).all
users.each { |user| puts user.posts.count }

Caching Strategies

Implement multi-level caching:

• Fragment caching for views
• Query result caching
• HTTP caching headers

Conclusion

Small optimizations add up to significant performance improvements.