What are your tricks for optimizing your Subversion configuration?
Solution 1:
I can't say much about the performance difference between BDB and FSFS, but I can definitely say that FSFS is far more stable. I'd suggest using it over BDB simply to preserve your sanity. When we had a largish repos running on BDB, we had to run recovery on it at least once a week, often several times. It was irritating. Now that we use FSFS, it's been rock solid.
Solution 2:
"svnadmin pack" is a neglected documentation command, but ran it often may be helpful especially if your commits are small.