Comment 1 for bug 309374

the stacked branch was created with

bzr branch --stacked http://bzr.notengoamigos.org/emacs-ce/trunk/

The performance for "log" with an unstacked branch:

 time bzr log sigaction.c >/dev/null

real 0m25.898s
user 0m24.900s
sys 0m0.595s

time bzr log --short sigaction.c >/dev/null

real 0m15.442s
user 0m15.020s
sys 0m0.400s