Run design processing at a lower priority (recommended for single-processor machines)

Runs a design process, such as a compilation, at a lower priority. This option is recommended for single processor machines because design processing tasks may use enough system resources to disable the Quartus® Prime user interface for the duration of the processing task. Turn this option on if you want to use the Quartus® Prime user interface while running a design process on a single processor machine. This option is turned off by default.