3.1 Set goals based on performance and energy impact

Define performance and environmental targets, and design content with awareness of the relative energy and processing cost.

Performance goals:
Set clear performance and environmental goals for the project, including limits on requests, elements rendered, or other measurable resource use.
Energy intensity:
Prioritize lower-impact design choices, paying attention to measurable differences in energy use across components. Complex structure, styling, and script-driven experiences along with graphics-heavy and media-rich rendering increase the computational complexity of rendering. Use more intensive approaches only where these add clear value.