cache id->rid pairs
cache the tag permissions
tuning of orientdb params
let's try to use connection pooling.....
deactivated the 1st level cache due json serialization problems
Upgrade to logback 1.1.2
due this issue that slows down the server under heavy load: http://jira.qos.ch/browse/LOGBACK-268?page=com.atlassian.jira.plugin.system.issuetabpanels:changehistory-tabpanel