OS X Mavericks is more than powerful. It’s power smart.

To help you get the most out of your Mac, we looked at everything. From how OS X works with the hardware to how it works with your apps. The closer we looked, the more ways we found to increase battery efficiency. And boost performance, too. Take a look at just a few of the advanced technologies that help your Mac work smarter, not harder.

Grouping operations allows your CPU to spend more time in a low-power idle state, using energy more efficiently with no compromise in performance.

Timer Coalescing. Split-second efficiency.

In OS X Mavericks, Timer Coalescing groups low-level operations together, creating tiny periods of idle time that allow your CPU to enter a low-power state more often. With its activity reduced up to 72 percent, the CPU uses less energy, giving your battery a break, too. This happens so fast you won’t notice a thing. And your Mac still gets just as much done just as quickly.1

App Nap. Stop losing power behind the scenes.

App Nap helps you save power when you’re working with multiple apps at the same time. OS X can tell when an app is completely hidden behind other windows. And if that app isn’t currently doing something for you — playing music, downloading a file, or checking email, for example — App Nap conserves valuable battery life by slowing the app down. But as soon as you start to use it again, the app instantly shifts back to full speed. It’s so seamless you’ll think it had been running that way all along. App Nap works the same way with Safari tabs, so only the visible tab is running at full speed. With App Nap, CPU energy use can be reduced by up to 23 percent.1

How it works:

An app enters App Nap when it's completely hidden from view and not actively working.

Safari Power Saver. Watch not. Waste not.

Many websites display animations using power-hungry plug-ins that can drain precious battery life. But OS X Mavericks is watching out for you. The new Safari Power Saver feature recognizes the difference between what you came to see and the stuff you probably didn’t. If the content is front and center it plays as usual. But if it’s off in the margins, Safari Power Saver pauses it. You’ll see a static preview, and it won’t run until you click to play it. So if you don’t want to watch something, it won’t take a toll on your battery life. With Safari Power Saver, when you’re browsing websites with plug-in content, your CPU will use up to 35 percent less power.2

iTunes HD playback efficiency. A feature made for double features.

OS X Mavericks improves the energy efficiency of iTunes HD video playback. So go ahead and watch iTunes HD movies full screen even when you’re unplugged. The video playback engine takes greater advantage of the efficient graphics hardware in your Mac and reduces the frequency of disk access. Even audio playback is more energy efficient. Altogether, your CPU will use up to 35 percent less energy while you’re watching video.3

Compressed Memory. For an even quicker, more responsive Mac.

Before memory compression
After memory compression
  • Inactive
  • Active
  • Inactive
  • Active
  • Free Space

Doing More.

The more memory your Mac has at its disposal, the faster it works. But when you have multiple apps running, your Mac uses more memory. With OS X Mavericks, Compressed Memory allows your Mac to free up memory space when you need it most. As your Mac approaches maximum memory capacity, OS X automatically compresses data from inactive apps, making more memory available.

Responsiveness under load4
OS X Mavericks
1.4x faster
OS X Mountain Lion
Baseline
Wake from standby4
OS X Mavericks
1.5x faster
OS X Mountain Lion
Baseline

Extra Fast.

Once the memory is compressed, your Mac doesn’t have to waste time continually transferring data back and forth between memory and storage. So it’s able to get more done in less time. And since compressing and decompressing happens almost instantly, the only thing you’ll notice is how responsive everything feels. Especially when you’re doing everything at once.

View the OS X Mavericks Core Technologies Overview

  1. Testing conducted by Apple in June 2013 using production 1.8GHz Intel Core i5-based 13-inch MacBook Air systems with 4GB of RAM and prerelease versions of OS X v10.9 and OS X v10.8.4. Systems tested with 8 applications launched, WPA2 Wi-Fi network connection, and an associated iCloud account while running on battery power. Performance will vary based on system configuration, application workload, and other factors.
  2. Testing conducted by Apple in June 2013 using production 1.8GHz Intel Core i5-based 13-inch MacBook Air systems with 4GB of RAM and prerelease OS X v10.9. Tested with prerelease Safari 7.0 with Power Saver on (default) vs. off. Systems tested with WPA2 Wi-Fi network connection while running on battery power. Performance will vary based on system configuration, application workload, and other factors.
  3. Testing conducted by Apple in May 2013 using production 1.8GHz Intel Core i5-based 13-inch MacBook Air systems with 4GB of RAM and prerelease versions of OS X v10.9 and OS X v10.8.4. Tested full-screen HD movie playback using prerelease iTunes 11.0.3 and iTunes Store content. Systems tested with WPA2 Wi-Fi network connection while running on battery power. Performance will vary based on system configuration, application workload, and other factors.
  4. Testing conducted by Apple in May 2013 and June 2013 using production 1.8GHz Intel Core i5-based 13-inch MacBook Air systems with 256GB of flash storage, 4GB of RAM, and prerelease versions of OS X v10.9 and OS X v10.8.4. Performance will vary based on system configuration, application workload, and other factors.