During January 2025, Burak Diler focused on performance-oriented refactoring across the ppy/osu-framework and ppy/osu repositories. He improved runtime efficiency by optimizing string splitting in SearchContainer.cs, removing unnecessary char array allocations while preserving existing filtering behavior. In the osu repository, he refactored the ManiaHitObjectComposer and OsuHitObjectComposer classes to eliminate redundant ToArray() calls after string splits, enhancing code clarity and reducing potential memory allocations. Working primarily in C# and leveraging skills in code refactoring and performance optimization, Burak delivered targeted improvements that simplified parsing logic, increased maintainability, and supported future extensibility without introducing risk or altering core functionality.