You may enable the Speed Control (CPU Throttle) setting at the
slide control in the Advanced Settings tab, or any time
during a volume cloning operation in the main window.
Alternatively, you may enable the option with the following command
/ni[:n]   where n is a number (0 - 10)
When XXCLONE is run in the background, it is often
desirable to run the XXCLONE task at less than the
full speed for improved performance for the foreground
and other tasks.
You may set the slide control or enter a numeric value
to control the processor usage.
A value of 0 (fastest) through 10 (slowest) may be entered
in the box next to /ni.
When the speed control parameter is 1 or larger, then,
XXCLONE will insert an idle period of varying length
during its clone operation between file and directory
accesses to control the task's demand to the processor.
Unlike other options in Advanced Settings tab, the
speed control setting can be changed at any time during a clone