Firebird  2.1.3

# The default authentication method on Windows platforms is no longer mixed. It has been changed to native. For more information, see the notes on the configuration parameter Authentication.

# A fix in Firebird 2.5 that alleviates the “hogging” behaviour of the nBackup utility has been backported to this patch release. For more information, see the Improvement in V.2.1.3 note in the nBackup section of the Utilities chapter.

# By popular request, Dmitry Yemanov adds some helpful performance guidelines pertaining to the “internals” of the database monitoring system (a.k.a. “MON$”). The purpose is to assist those using this facility on heavily loaded systems to employ it in ways that provide the information you want while minimising its impact on the end-user experience.