At the Apple event on October 22, 2013, Apple revisited Mavericks, first announced at WWDC in June. In addition to the features previously announced, we were shown updates to the notification system. Users can, for example, respond to messages from the notification pop-up, without having to switch apps.
Also at the October event, we got a few more details about what's under the hood in Mavericks. The new Mac OS boasts a feature called "Compressed Memory," which Apple says allows the OS to cram up to 6GB worth of data into as little as 4GB of physical RAM.
Mavericks is also smarter about how it splits shared memory between the CPU and GPU. Rather than using a fixed 512MB allocation, like previous OS X versions, v.10.9 can adjust the GPU's share of available RAM. When processing video streams, for example, the GPU can get as much as 1GB of RAM to work with.
Mavericks is also more efficient when sipping battery power. For example, Apple pointed out at the October event that upgrading the current 13-inch MacBook Air to Mavericks nets the user up to an hour more Web browsing, and up to 1.5 hours more iTunes movie playback.
In probably the most welcome Mavericks announcement at the October event, Apple stated that it was going to "revolutionize pricing" by offering the newest version of Mac OS X as a free update for current and past Mac users. Even if you've got an iMac from 2007 (running Snow Leopard), Apple claims you'll be able to run and benefit from OS X 10.9 Mavericks.
At WWDC 2013 in San Francisco, Apple Senior Vice President of Software Engineering Craig Federighi announced OS X 10.9 Mavericks, an update to its desktop operating system. The new software includes face-lifts for iCal and iBooks, file-tagging capabilities, and iCloud Keychain.
The new OS X supports menus across multiple displays. You can summon the Dock, and when you enter full-screen, other displays are left untouched. You can also pan between spaces on each display without messing with the others.
Safari's home page for top sites will include bookmarks, a reading list, and shared links. You'll now be able to rearrange your Top Sites, and you can drag and drop a bookmark from the sidebar to keep a favorite site handy.