Worked on the swiss-ai/lm-evaluation-harness repository to deliver a targeted CLI startup performance optimization feature. Addressed slow command-line interface initialization by implementing lazy loading of submodules and deferring the import of the evaluator module until its functions were required. This approach reduced CLI startup time from 2.2 seconds to 0.05 seconds, directly improving responsiveness and the overall developer experience. The solution was developed using Python, with a focus on CLI optimization and lazy loading techniques. No bugs were fixed during this period, as the primary focus was on enhancing performance through efficient module management and streamlined import processes.