Worked on UI performance improvements in the openjdk/jfx repository, focusing on optimizing selection handling for TableView, TreeTableView, and TreeView components. Addressed long-standing latency issues by introducing an optimized event firing mechanism for multi-cell TableView selections and implementing a depth-first search iterator to reduce selection time complexity from O(N^2) to O(N) in TreeTableView and TreeView. Enhanced sorting and selection path performance, particularly during large selection operations such as selectAll. Collaborated closely with code reviewers to ensure correctness and maintainability. Utilized Java for both performance optimization and UI development, delivering a targeted feature that improved responsiveness for complex selection scenarios.