Finally, there's App Nap, which gives the CPU priority to the app you're using, rather than any other apps that are open in the background.
I've been using Mavericks since the first developer build was released in the summer, and it's been largely stable. In fact, I often forgot that this was still a work in progress.
Of course, all software is constantly a work in progress. If you're one of those computer users who likes to wait for the first or second update to be released before you switch, you'll no doubt have plenty of company. But for most users, the upgrade should go smoothly.
The issues I've noticed so far are mostly minor. For instance, I've had apps suddenly stop accepting gesture input. I had to quit the troublesome app and relaunch it to get rid of the problem. I've also seen some apps forget their place in the new Spaces setup, forcing me to go to Mission Control to get the app visible again. As always, check your hardware and software for compatibility before upgrading.
Enterprise users should note that Mail is still a bit problematic, especially when connecting to an Exchange server. I've found that the Mail app will sometimes drop a connection and stop updating; I've had to quit and re-launch the app to reestablish a connection with the Exchange server. Unfortunately, this bug isn't new to Mavericks, and it's certainly not fixed here.
Overall, I like Mavericks, which isn't a surprise given that I liked its predecessor. It doesn't represent the UI overhaul that iOS 7 did on the mobile side, but it continues to refine OS X, applying polish where needed. Laptop users should be able to notice increased battery life as developers incorporate changes to their apps, and the inclusion of Maps, iCloud Keychain and iBooks should make it easier to seamlessly jump from one Apple device to another.
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