The full command-line option is /[NO]OPTIMIZE[=(option-list)].

    Specifies optional assembler optimizations. Valid items in the
    option-list are:

    Option   Function

    SCHEDULE Specifies instruction scheduling.
    PEEPHOLE Specifies peepholing.

    Specifying /OPTIMIZE with no options is the same as specifying
    /OPTIMIZE=(PEEPHOLE,SCHEDULE).

    The default qualifier is /NOOPTIMIZE.