mcagent.exe is a process belonging to McAfee Internet Security suite. This process ensures the computer's virus definitions are up to date by communicating with the McAfee VirusScan server on the network.
This program is important for the stable and secure running of your computer and should not be terminated.
Non-system processes like mcagent.exe originate from software you installed on your system. Since most applications store data in your system's registry, it is likely that your registry has suffered fragmentation and accumulated invalid entries which can affect your PC's performance. It is recommended that you
check your registry to identify slowdown issues.