How OS X Mavericks will save you power and boost performance

How OS X Mavericks will save you power and boost performance

OS X Mavericks is the first OS X build to be named for something other than a big cat (Apple has run out of feline names, so they're switching to place names). it takes its name from a popular big wave surfing spot in northern California, not too far away from Apple's headquarters in Cupertino. And indeed, Mac users will be catching some big waves when Mavericks makes its way into the Mac App Store this fall.

Mavericks' claim to fame (the place, not the OS) is the giant waves it produces - 25 to 80 feet high, the biggest in California. They happen when the wind and the water interact with an unusual rocky reef formation under the surface.

Some of the most important changes to OS X Mavericks are also under the surface, where Apple has emphasized dramatically improved power and memory management. Apple sells more laptops than desktops, so it's no wonder the company wants to make Mavericks as thoroughly optimized as possible for the MacBook Air and Pro experience. But all users will benefit.

Sipping power without sacrificing horsepower

Timer Coalescing, App Nap, and Safari Power Saver are all new Mavericks features designed to extend battery life. Timer Coalescing enables the CPU to drop into low power mode more frequently, while App Nap intelligently observes what an app hidden behind other windows is doing. And if the app isn't running background tasks that need to stay active - playing music, for example, or processing data - App Nap slows it down, thus conserving juice. Similarly, Safari Power Saver helps to reduce Safari's power consumption by not loading cycle-sucking plug-in content until you actually want to watch or interact with it.

iTunes HD is another place in Mavericks where power reduction has been emphasized. The new version more efficiently uses the graphics hardware inside the Mac, reduces disk access and makes audio playback more energy-efficient - that adds up to up to 35 percent less waste than before when playing video, says Apple.

Jogging your Mac's memory

It's easy to open a bunch of apps and a bunch of windows without thinking about how that impacts your Mac's available memory. Mavericks introduces Compressed Memory - it compresses data from inactive apps, making more memory available when it's needed.

This reduces the size of swap files that need to be written out to disk when physical memory is short. Smaller swap files mean less disk access, which translates into improved performance. How improved? Apple is estimating that Maverick's responsiveness under load is about 1.4x better than Mountain Lion. Waking from Standby mode sees an even bigger benefit: 1.5x better than Mountain Lion.

Some of these new technologies will require buy-in from developers to get the most benefit, so it's good that Apple's providing developer builds of Mavericks now and giving Mac devs time to optimize before the OS is released this fall. We'll all benefit from the changes once they're here.

Peter Cohen

Managing Editor of iMore, Mac and gaming specialist and all-around technologist. Follow him on Twitter @flargh

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How OS X Mavericks will save you power and boost performance

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I wonder how much more battery life will the Mac book pro get, I'd be happy with even just 1 hour more.

unstoppablekem: I have a late 2008 MacBook (aluminum). I can't speak for all of the OS X upgrades since the only ones I've purchased and installed were Snow Leopard (10.6) and Mountain Lion (10.8), but I did notice a speed increase after installing each of them. I've even noticed that Apple occasionally gives unexpected goodies in their updates, such as when they did a firmware update that lets me use 8GB instead of 4GB on my MacBook, which gave me a phenomenal speed boost. (More details are available by Googling "“Secret” Firmware lets Late ’08 MacBooks use 8GB".) So I'm actually quite excited about the Mavericks upgrade, especially seeing that it will apparently work on my older machine (or at least the developer version will). I'm already wanting to install this yesterday.

Admittedly, the benefit of the firmware update I mentioned above may have been unintentional on Apple's part, but it's one of the things that has led me to expect good things from Apple's software updates.

It was weird that Apple mentioned all of the software magic they worked to optimize battery life. Then they followed-up by mentioning Haswell. So, for me, it was unclear which was more responsible for the battery life boost.

I suspect that's no mistake.

Clearly the Haswell Macs are going to have the most optimized and maximum power savings, but Mavericks should increase battery life of all Macs it gets installed on. These are some pretty cool features, and should be a very welcome addition.