18 ms·It would be interesting to know the build number.by toksaitov 14y agoIt would be interesting to know the build number.jmck 14y agoit's the same build as the GM.Fire30 14y agoI believe the build number is 12A269 http://en.wikipedia.org/wiki/OS_X_Mountain_Lion http://en.wikipedia.org/wiki/OS_X_Mountain_Lion