vc-print-log vs. bzr log

[Stephen Berman]

When I'm visiting a file on a local branch of the Emacs bzr trunk and
type `M-! bzr log -r-1 RET' I see the log entry in less than one second.
When I type `C-x v l RET RET' ±19 seconds elapse before the log is
displayed (and the lag time is the same if I limit the display to one
entry).  Is this time difference expected?  Is there a quicker way to
view log entries within VC?

Steve Berman