If your desktop appears but stays sluggish for a long time, or chat, game store and updater windows open one after another as soon as you sign in, too many apps are starting automatically. They slow down startup and keep using memory and processor time in the background all day. In Windows you decide which apps start when you sign in, either from Settings or from Task Manager; an app you turn off is not uninstalled, it simply waits until you open it yourself. The steps are largely the same in Windows 11 and Windows 10, and we point out where they differ.