Energy efficiency is improved through reduced background activity and new support for the trigger starting of system services. Windows 7 also offers improvements in the Windows kernel that enable applications and services to scale efficiently between platforms. Performance of many features and APIs is improved in Windows 7 versus Windows Vista. For example, driver performance on servers is optimized by new user-mode and kernel-mode topology APIs. Graphics rendering is considerably smoother and faster. Accessibility performance is also significantly faster than before, explained Microsoft.