Performance seems to be stabilising, however it may be erratic over the next 96 hours or so. The initial issue was caused by some corruption on the database due to a degraded RAID array on our primary database server. While in a degraded state replication lagged and we started seeing some strange data replication. The faulty disk has been replaced and we've failed over to your secondary database server for most queries while the array rebuilds. Site and API performance may be slow until this is complete.
Apologies for the issues.