lucoms.exe is a part of Symantecs Internet security suite and deals with mainly live updates, which keep your product up to date from the latest security threats. This program is important for the stable and secure running of your computer and should not be terminated.
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Non-system processes like lucoms.exe originate from software you installed on your system. Since most applications store data in your system's registry, it is likely that over time your registry suffers fragmentation and accumulates invalid entries which can affect your PC's performance. It is recommended that you check your registry to identify slowdown issues