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Benchmarks Show iPhone Performance Difference When iOS 9's Low Power Mode is Activated

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Original poster
Apr 12, 2001
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With iOS 9, Apple introduced a Low Power mode, designed to extend battery life when an iPhone's power is running low. According to the feature's description, Low Power mode works by reducing an iPhone's performance and cutting down on background activity.

Geekbench 3 has just been updated to work with iOS 9, letting us get a more detailed look at how Low Power mode works and how much it throttles an iPhone's CPU performance when activated.

Without Low Power mode activated, an iPhone 6 Plus scored 1606 on the single-core processor test and 2891 on the multi-core processor test. When Low Power mode was turned on, the same iPhone 6 Plus scored 1019 on the single-core test and 1751 on the multi-core test, suggesting there's a significant performance reduction when Low Power mode is enabled to save as much battery as possible.


Results were similar on an iPhone 5s, with performance reduced by about 40 percent. We saw single/multi-core scores of 1386/2511 without Low Power mode and scores of 816/1405 with Low Power mode turned on.

Low Power mode activates when an iPhone is at 10 or 20 percent battery level, providing a popup that lets users toggle it on quickly. It can also be turned on via the new Battery section of the Settings app. When it's turned on, in addition to lowering CPU speeds, Low Power mode also disables Mail Fetch, Background App Refresh, motion effects, and animated wallpapers.

Indicated by a yellow battery icon, by limiting performance and disabling battery draining features, Low Power mode can extend an iPhone's battery life by up to three hours. Other performance improvements in iOS 9 extend the iPhone's battery by an hour even when Low Power mode is not enabled.

iOS 9 is currently available to developers and will be released to the general public in the fall.

(Thanks, Brandon!)

Article Link: Benchmarks Show iPhone Performance Difference When iOS 9's Low Power Mode is Activated
 

Arrr

macrumors newbie
Apr 29, 2015
22
62
I'm not surprised at the performance throttling, did anyone think the low power consumption was just "Apple Magic" or something? Lowering power consumption can only be done a few different ways.

I know most people love the battery life on their iPhones as is, but this should satisfy those who need an extra push at the end of the day.
 
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KALLT

macrumors 603
Sep 23, 2008
5,173
3,218
Good on Apple for even creating this mode, most people I know love the battery life on their iPhones as is.

I wouldn't say 'love it', but it's alright. However, it can't typically compete with the battery life of flagship Android devices. I give credit to Apple when it comes to optimising their energy usage, seeing what they can achieve even with a relatively small battery.
 
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keatth

macrumors 6502
Aug 24, 2013
496
129
I love this mode but it needs a toggle in the Control Center.

Conversely, calculator doesn't really need to be in the Control Center any longer since spotlight/search can make calculations now.

But that calculator app is so beautiful and I love using it and I won't stop! I love having it in control center so it downer crowd the first page of apps.
 
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TechGod

macrumors 68040
Feb 25, 2014
3,183
933
New Zealand
Are there any iOS 9 features that are not available on the iPhone 4S or other A5 devices?

But that calculator app is so beautiful and I love using it and I won't stop! I love having it in control center so it downer crowd the first page of apps.
Or, Apple could just make control centre customisable.
 
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teslo

macrumors 6502a
Jun 9, 2014
929
599
I love this mode but it needs a toggle in the Control Center.

Conversely, calculator doesn't really need to be in the Control Center any longer since spotlight/search can make calculations now.

if we're on control center limitations, for god's sake - let us select a dropdown of BT devices when we want to launch BT. what's the point otherwise? i mean if you only have one device and one BT accessory, sure...
 
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a.gomez

macrumors 6502a
Oct 10, 2008
924
726
Well, not sure how else this was going to get done. If you have a long trip and just need your phone to stay alive for calls, text and day to day apps this will still be a great option. I have something similar on my Job's Xperia, and it was great when I had to fly to South Africa from NY
 
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keatth

macrumors 6502
Aug 24, 2013
496
129
if we're on control center limitations, for god's sake - let us select a dropdown of BT devices when we want to launch BT. what's the point otherwise? i mean if you only have one device and one BT accessory, sure...

Maybe force touch in the next update will do that, but then it's like an easy access menu inside of an easy access menu and the whole thing is meant to be clean and simple and quick, so maybe not?
 
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Benjamin Frost

Suspended
May 9, 2015
2,405
4,999
London, England
Reducing power consumption and reducing processor work is great news. It would be wonderful to be able to adjust this on the fly, to choose low power mode so that one can have longer battery life. Not just on the iPhone but all devices. We've had that in varying degrees on the Mac for a long time.

It would be good if one could programme one's wife to go in to low-talk mode when one's brain is becoming frazzled at the end of the day.
 
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stol

macrumors member
Apr 11, 2011
99
33
Greece
I love this mode but it needs a toggle in the Control Center.

Conversely, calculator doesn't really need to be in the Control Center any longer since spotlight/search can make calculations now.

Leave the calculator button right where it is please!

Also, a low power toggle semantically fits better in the upper row of control center.
 
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Dj64Mk7

macrumors 65816
Sep 15, 2013
1,189
347
Neither the A5 nor the A6 can take advantage of the performance improvements brought by Metal.

Wasn't that the case in iOS 8 as well? Or are there additional performance gains not available to devices without Metal>
 
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