VMS Help Sys Parameters, WSDEC  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Increasing the value of this parameter tends to increase the
    speed with which working set limits are decreased when the need
    arises.

    On VAX systems, WSDEC specifies the number of pages by which
    the limit of a working set is automatically decreased at each
    adjustment interval (which is quantum end). At a setting of 35,
    for example, the system decreases the limit of a working set by
    35 pages each time a decrease is required.

    On Alpha systems, WSDEC specifies the number of pagelets by which
    the limit of a working set is automatically decreased at each
    adjustment interval (which is quantum end). At a setting of 35,
    for example, the system decreases the limit of a working set by
    35 pagelets each time a decrease is required.

    WSDEC has the AUTOGEN, DYNAMIC, and MAJOR attributes.