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To reduce API latency in a synchronous Rails backend, you can use the parallel gem to run independent I/O tasks concurrently within a request. This is especially useful for external API calls or other non-DB-bound operations. However, it should be implemented carefully inside service objects rather than controllers to keep the code clean and maintainable. When working with ActiveRecord, each thread must safely acquire its own database connection using ActiveRecord::Base.connection_pool.with_connection to avoid connection issues. It is also important to avoid shared mutable state between Crossy Road threads to prevent race conditions. In general, parallel processing should only be used for truly independent tasks, while heavy database operations should be optimized separately using caching, background jobs like Sidekiq, and query optimization techniques such as eliminating N+1 queries.