Process Priority

Every process has a read-only BasePriority property that indicates its priority.
Realtime (24) - runs without interruption
High (13) - other processes can run occasionally
Normal (8) - allocates equally among all the other priorities
Idle (4) -

It is possible to change this priority by assigning a different value to the PriorityClass property

excel_process.PriorityClass = System.Diagnostics.ProcessPriorityClass.High