MongoDB 8.0 is a highly secure, durable, available, and performant version of MongoDB that offers significant performance improvements over its predecessor, MongoDB 7.0. The development of MongoDB 8.0 involved an 8.0 multi-disciplinary tiger team focused on performance, which was later expanded into a broader "performance army" to achieve the desired improvements. Key benefits include improved read and mixed read/write workloads, as well as enhanced durability guarantees through the introduction of a new write concern majority setting. The team implemented various strategies to improve performance, including optimizing simple queries, reducing replication latency, and catching small regressions using benchmarking tools like YCSB and Perfetto. Additionally, the development process involved a shift from a tiger team approach to an "army" model, which brought in 75 additional engineers to work on performance-related tasks, leading to further improvements and a wider range of enhancements. Overall, MongoDB 8.0 represents a significant milestone in the company's commitment to delivering high-performance databases.