This privilege determines which user accounts can increase or decrease the size of a process's working set.
Increase a process working set

This privilege determines which user accounts can increase or decrease the size of a process's working set.

The working set of a process is the set of memory pages currently visible to the process in physical RAM memory. These pages are resident and available for an application to use without triggering a page fault. The minimum and maximum working set sizes affect the virtual memory paging behavior of a process.

Warning: Increasing the working set size for a process decreases the amount of physical memory available to the rest of the system.