Improving aesthetics while maintaining performance requires balancing design with functionality. Power BI developer should use a consistent color scheme and typography across reports for a professional look. Limit the number of visuals per page and avoid overly complex interactions that can slow down the dashboard. Use transparent backgrounds, white space, and alignment tools to organize visuals neatly. However, keep performance in mind—complex DAX calculations or too many real-time visuals can degrade performance. A clean, visually appealing, and functional design ensures that users can easily interpret the data without experiencing slowdowns.