Performance Tuning

I have repository of around 5GB. It is starting to get somewhat sluggish.
I know that about 2.5 GB is taken up by unused db logs. I could get rid of
them, but speed of update and checkout is my main concern, not disk space.
I gather that logs that are unused cannot really be causing a performance
problem.
 
I have been reading through the Red Bean Book and have started on the Sleepy
Cat Wiki on the Berkeley DB, but I have yet to find this kind of tuning
advice, I had hoped. I would like to find some kind of information on
diagnosing problems and tuning my way out of them.
 
Does any one know of tools to analyze, stress and tune the subversion
repository? If not, then I guess I'll just use the basic UNIX OS
performance tools and some stressing scripts, but I'd rather not re-invent
the wheel.
 
Thanks for the help
 

--
Peter Kahn
pkahn@connected.com