Weigh a 30% benchmark win from an atomics queue

Your message broker is written in Rust and passes work between threads through a Mutex<VecDeque>. A teammate had an agent write a lock-free queue with atomics, for many producers and many consumers, in an afternoon. It passes the existing tests and a new stress test, and a benchmark shows 30% more throughput. They want to merge it this week.

Do you merge it? Decide, and say what would change your mind.