Microsoft is introducing an update for Windows 11 called Adaptive Energy Saver, which optimizes energy consumption based on device activities to enhance battery longevity for portable devices like laptops and tablets. Unlike the existing energy saver mode that activates at low battery levels, the Adaptive Energy Saver assesses system workload to determine when to conserve power without changing screen brightness. This feature is not available for desktop PCs but is being rolled out to users in the Windows Insider program, with a broader release expected later this year.