N/A Non-system processes like csc.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.
But definitive most often refers specifically to a judgment or description that serves as a standard or reference point for others, as in the definitive decision of the court (which sets forth a final resolution of a judicial matter) or the definitive biography of Nelson (that is, the biography that sets the standard against which all other accounts ...
1 [uncountable] a process of reasoning in which a conclusion must follow from the premises presented; 2  reasoning or concluding from the general to the particular or specific. [ 3 countable] a conclusion reached by this process.