Worked on the Tencent/libpag repository to address a critical issue affecting the accuracy of performance metrics in the PAGPlayer timing pipeline. Focused on C++ development and performance optimization, the work involved fixing a bug where the presentingTime method could return negative values. The solution refined time accounting by removing image decoding time from the total presenting time in FileReporter and excluding texture upload and program compilation times from the calculation. This adjustment improved the reliability of performance analytics and dashboards, ensuring compatibility with existing rendering workflows and metrics collection. The work emphasized precise bug fixing and robust validation across the codebase.