GitHub Copilot tackles design optimization and cost efficiency by considering requests from engineering to reduce compute power, factor in design interactions, and streamline user request generation. The correlation between cost and response time influences decisions, leading to strategies like prefetching, real-time data retrieval, and caching. Understanding system intricacies and terminology facilitates better caching opportunities and faster responses, aligning with the notion that costlier processes are usually slower. Balancing user experience with product design considerations broadens the scope beyond UX, requiring familiarity with various terminologies and challenging established norms for innovative solutions. Despite initial overwhelming moments and naive ideas, incorporating fresh perspectives from newcomers can lead to revisiting discarded concepts and achieving new milestones.