Apple has released the second Developer Preview of OS X 10.9 Mavericks



From 9to5Mac:

Also available are fresh seeds of Xcode 5 and OS X Server. Below, we’ve compiled changes in the new Mavericks seed:

- Moving around and using the OS seems much snappier and more stable
- Minor UI tweaks in Safari
- Tweaks to share/Message buttons in Notification Center
- iCloud Keychain setup prompt
- Migration Assistant now functional
- Improved performance for select files viewed in Preview

  Apple releases OS X Mavericks Developer Preview 2