I just noticed you are still running 0.9.6 - I strongly suggest you upgrade. The problem is as I decribed above, however the fix is already present (and has been for quite some time, it turns out) which reduces the mass of queries into just the 3 or 4 required.
Jason Rhinelander
Gossamer Threads
jason@gossamer-threads.com
Jason Rhinelander
Gossamer Threads
jason@gossamer-threads.com