/sys$common/syshlp/helplib.hlb FONT, Qualifiers, /MINBOX  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /MINBOX
       /NOMINBOX

    On VAX only, specifies that the compiler produce the minimum
    bounding box for each character in the font and adjust values
    for the left bearing, right bearing, ascent, and descent of
    each character accordingly. Character width is not affected.
    Specifying the /MINBOX qualifier is equivalent to converting a
    fixed font to a monospaced font.

    Using the /MINBBOX qualifier has two advantages. Because the font
    compiler produces minimum instead of fixed bounding boxes, the
    resulting SNF file is significantly smaller than the comparable
    fixed font SNF file. Consequently, both disk requirements for
    storing the font and server memory requirements when a client
    loads the font are reduced. Also, because the resulting font
    comprises minimum inkable characters, server performance when
    writing text is increased as much as 20 percent.