The Breakdown Chart in Bitrise has undergone significant improvements, addressing issues with too many lines on the chart and outliers. The new features include a legend under the chart to identify individual lines, a Breakdown Table that provides detailed data and allows for sorting and filtering, an Export Data option to export data for further analysis, and a Related builds section moved to a new tab for easier access. These changes enhance the overall experience of using the Breakdown Chart, making it more intuitive and user-friendly for analyzing and comparing workflow performance.