Openfire 3.10.2 has been released with a performance fix.
http://www.igniterealtime.org/builds/openfire/docs/latest/changelog.html Bug [OF-992] - Downgrade Apache MINA to version 2.0.7 to fix performance and 100% CPU issue [OF-924] - Enable LDAP SSL Connection Pooling
Pushed as: >*openfire-3.10.2 (25 Jun 2015) > > 25 Jun 2015; Sergei Trofimovich <slyfox@gentoo.org> +openfire-3.10.2.ebuild: > Version bump, fixes 100% CPU hog. Bug #553158 by Timo Rothenpieler. Thank you!