I recently noted that VisForVoltage performance had fallen off considerably. I've discovered the cause.
On May 25, Dreamhost had moved part of my account -- and fixed things to that the database server was in Portland, while the VPS server running VisForVoltage (and LongTailPipe) is in Virginia. That's precisely when the performance problem landed on us.
Dreamhost is supposed to move things this weekend so that the database and VPS are in the same data center. That should happen tonight (Saturday) sometime between 9pm and 3am PDT.
Once the two are in the same data center, performance should return to what it was before May 24.