During June 2025, Brandon Van Seggelen focused on optimizing the OxygenRoom component in the st0x0ef/stellaris repository. He refactored the system to store oxygenated block positions using a HashSet rather than an ArrayList, leveraging his knowledge of Java and data structures to improve lookup efficiency during oxygenation checks on large maps. This adjustment reduced CPU overhead while maintaining existing functionality, addressing performance bottlenecks in the original implementation. Although the scope was limited to a single feature and did not include bug fixes, the work demonstrated a thoughtful approach to performance optimization and laid groundwork for further enhancements in the codebase.