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SetPriorityClass - a function that sets the priority class for a specified process. This function is specific to Windows.

The SetPriorityClass may have one of the following priority classes:

  • HIGH_PRIORITY_CLASS <= High performs tasks immediately.
  • IDLE_PRIORITY_CLASS <= Idle performs tasks when the system is idle.
  • NORMAL_PRIORITY_CLASS <= Normal performs tasks at regular speed.
  • REALTIME_PRIORITY_CLASS <= Real Time performs tasks immediately and above all other tasks, including operating system tasks.

Use caution when using REALTIME_PRIORITY_CLASS. It can potentially take so much of the CPU resources that there may not be anything left for other items to run, including operating system requests.


uses Windows; // Unit containing the SetPriorityClass function.

procedure TForm1.FormCreate(Sender: TObject);
     SetPriorityClass(GetCurrentProcess(), HIGH_PRIORITY_CLASS);
     // Sets the current running application to High Priority.