The fast.exe is a Super Fast User Switcher.
This file is part of Microsoft Windows Operating System. Fast.exe is developed by Microsoft Corporation. It’s a hidden file. This files starts on Windows startup. Fast.exe is usually located in the %SYSTEM% folder and its usual size is 48,704 bytes.
Author: Microsoft CorporationProcess: Super Fast User SwitcherPart Of: Microsoft Windows Operating SystemCommon path(s): %SYSTEM%
subfolder in %PROGRAM_FILES%Keywords(s): hidden, startupFilesize(s): 48,704 bytes, 49,216 bytes, 401,408 bytes