Microsoft has advised Windows 11 users to enhance system performance by managing startup applications. Users can disable unnecessary startup apps by going to Settings, selecting Apps, and then Startup. The Task Manager provides detailed insights into startup apps, including their enabled status and a "Startup impact" rating categorized as low, medium, or high based on CPU time and disk activity. Users are cautioned to be careful when disabling high-impact apps, as some may be essential for security or system functionality. Disabling a startup app does not uninstall it, allowing for re-enabling later. Additionally, users can manually add applications to startup using specific commands in the Run dialog.