psiservice.exe – This process belongs to a licensing service by Protexis. This service is installed with programs, such as Corel’s, to provide product licensing protection and other authorisation services. This process is vital and if terminated, the programs that make use of it will no longer function.
Non-system processes like psiservice.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