We're currently experiencing extremely high traffic conditions. The Santa cluster, which contains the largest number of users among the clusters, is overloaded and is causing site peformance to be not-so-great. We're working on a temporary fix, but can't really change the database configuration while load is this high without causing downtime.
We're expecting a shipment of new servers any time now, and that should help things significantly.
alanj and I will keep you updated if things change. Thanks for your patience.