Worked on the com-lihaoyi/mill repository to address performance issues in terminal polling by stabilizing terminfo polling behavior. Focused on reducing excessive CPU and I/O load caused by the polling thread, the solution involved memoizing terminal dimensions to avoid unnecessary writes while preserving expected runtime behavior. Applied expertise in Java, concurrency, and system programming to implement and validate the fix, ensuring stability across development and integration environments. The change was consolidated as a core reliability improvement, directly responding to long-standing contributor concerns and performance reviews. This work enhanced Mill’s runtime efficiency without introducing regressions or altering terminal interaction semantics.