[Tracker] "Desktop Search" Performance

[Adam Tauno Williams <awilliam whitemice org>]

tracker-0.12.5-3.4.1.x86_64
openSUSE 12.1 / x86_64 3.1.0-1.2-desktop
Intel i7 Q720, 6GB RAM

I use Tracker in GNOME 3.2.1.  It works very well; it indexes document
content very effectively for all the file-types I have.

But I'm curious if there is a setting or technique I can use to improve
search performance.  Searching using "Desktop Search" works, but seems
to take a fairly long time [the utility displays the whirling search
indicator, usually for about 15 seconds]

My .local/share/tracker is ~57MB.  Mostly that seems to be the
tracker-store journal 46MB and its related backup files.