Library /sys$common/syshlp/pca$help.hlb Frequently Asked Questions, Analyzing Individual Instructions  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    How can I find the specific instructions within a line that are
    taking the most time?

    Use PLOT LINE module_name\%LINE nnn BY BYTE. Then, look at a
    machine listing to correlate byte offsets from the beginning of
    the line to the specific instructions.