Long time between updates.
Most recent upgrade to our systems is the establishment of a dedicated Mysql/Postgresql server for use with our WordPress and Drupal CMS servers, and to hold other databases.
So far, We have migrated 18 or so WordPress databases to this server. Next up is migration of remaining WordPress databases, the Drupal instances and other databases to the central server.
To date, this upgrade has resulted in significant improvement to the performance on out main WordPress server, mostly because it allows the web server to act as a web server, and offload all the database queries to a dedicated platform.