Apple has just released the seventh OS X 10.9.2 Mavericks to developers. There are no big changes or feature addition in the OS for the beta build 13C62. As users have complained of bad Gmail and smart folder performance in the OS X Mail app ever since its launch, Apple has asked developers to focus on Mail, Messages and Graphics.There are  These improvements were noted in OS X 10.9.1, but some Gmail issues still remain.