Usability & iOS 7

The iPad Air remains one of the best consumer tablet experiences around. The OS and Apple’s first party applications are both extremely well suited to the tablet, and there’s a very healthy ecosystem of third party applications to fill in the gaps left by Apple.

Lately Apple has been doing wonders to limit those gaps. Both iLife and iWork suites are now free with the purchase of any new iOS 7 device, including the iPad Air. Previously each of the three iLife apps set you back $5 a piece ($15 total), while the iWork apps were priced at $10 a piece ($30 total). Apple has truly embraced its role as a devices and software company and is using the latter to help sell the former. On the one hand this is an admission that the market is growing more competitive, as tossing in free software is a great differentiator. On the other hand, freeing up iLife/iWork is a vote of confidence in Apple’s ability to continue to demand a premium for its hardware. Neither suite comes preinstalled on the iPad Air, but upon a visit to the App Store users are reminded that they can get all six of the apps for free if they should desire to. I suspect part of the reason that they’re not bundled by default is to avoid eating up space on the devices with less NAND by default.

The core iOS apps are quite approachable and easy to use. Applications like Safari and Mail make great use of the high resolution screen. Obviously the same can be said for things like Photos and iPhoto. The virtual keyboard experience is great on the large display (especially in landscape mode). Honestly, if there was a good Google Hangouts app (the Android version is much better in my experience) for iOS 7 I think I could be very comfortable and productive on the iPad Air.

I find that task switching is far better on the iPad than it is on the iPhone since multitasking gestures are supported. A four finger swipe left/right between applications or up/down to bring up the task switcher is so much quicker for me than a double tap of the physical home button. Similarly a five finger pinch to get back to the home screen from any application is significantly faster. The new iOS 7 multitasking UI feels so much more at home on the iPad’s large display as well.

My only complaint about task switching on the iPad Air is that UI frame rate will regularly drop below 30 fps during some of these transitions. The added GPU performance on the A7 doesn't seem to really impact things compared to the A6X, so I’m fairly convinced at this point that the solution to the problem will have to come in software. It’s quite reminiscent of the Retina MacBook Pro UI frame rate issues under Mountain Lion, although not nearly as bad (and I’m hoping it won’t take a year to get these ones resolved).

The release of iOS 7.0.3 addressed (at least partially) some of my concerns around the OS. As I already mentioned, stability on 64-bit platforms seems somewhat improved - at least compared to the initial release of iOS 7. The other big improvement in my mind is the ability to turn off/reduce the transition animations. The impact to usability on the iPhone 5s is huge, but it’s also pretty significant on the iPad Air. The animations themselves are pretty but I find that they get repetitive after continued use.

Memory Size & The Impact of 64-bit Applications

The iPad Air, like the iPhone 5s, ships with 1GB of LPDDR3 memory. Apple frowns upon dissection of review samples but I think it’s a safe bet that we’re not talking about a PoP (Package-on-Package) configuration but rather discrete, external DRAM here. It’s also probably a safe bet that even the iPad mini with Retina Display will ship with 1GB of memory as well.

Something I didn’t have time to address in my iPhone 5s review was the impact of 64-bit applications on memory usage. I actually ran some tests after the 5s review hit but never got the chance to share the data, so I figured now is as good a time as any to do just that.

Unlike traditional desktop OSes, iOS doesn’t support paging to disk (or in this case, NAND). Application data can either reside in memory or the associated process is terminated and has to be reloaded the next time you request it. It’s a decision likely made to both maintain user experience and limit the number of program/erase cycles on the internal NAND.

The good news is that iOS was architected to run on as little hardware as possible and as a result tends to be quite memory efficient. There are also power implications of going to larger memories. The combination of these two things has kept Apple on the conservative side of increasing memory capacity on many iDevices.

The move to a 64-bit platform however does complicate things a bit. Moving to a larger memory address space increases the size of pointers, which in turn can increase the footprint of 64-bit applications compared to their 32-bit counterparts. So although there’s clearly a performance uplift from app developers recompiling in 64-bit mode (more registers, access to new instructions), there’s also an associated memory footprint penalty. Since the iPad Air and iPhone 5s don’t feature a corresponding increase in memory capacity, I wondered if this might be a problem going forward.

To find out I monitored total platform memory usage in a couple of scenarios. Before measuring I always manually quit all open apps and performed a hard reset on the device. Note that the data below is reporting both clean and dirty memory, so it’s possible that some of the memory space could be recovered in the event that another process needed it. I hoped to minimize the impact by always working on a cleanly reset platform and only testing one app at a time.

I looked at memory usage under the following scenarios:

1) A clean boot with no additional apps open
2) Running Mobile Safari with 4 tabs open (two AnandTech.com tabs, two Apple.com tabs, all showing the same content)
3) Infinity Blade 3 (64-bit enabled) sitting at the very first scene once you start the game
4) iOS Maps in hybrid view with 3D mode enabled, with a WiFi assisted GPS lock on my physical location
5) Google Maps in the same view, under the same conditions. I threw in this one to have a 32-bit app reference point.

In general you’re looking at a 20 - 30% increase in memory footprint when dealing with an all 64-bit environment. At worst, the device’s total memory usage never exceeded 60% of what ships with the platform but these are admittedly fairly light use cases. With more apps open, including some doing work in the background, I do see relatively aggressive eviction of apps from memory. The most visible case is when Safari tabs have to be reloaded upon switching to them. Applications being evicted from memory don’t tend to be a huge problem since the A7 can reload them quickly.

The tricky part is you don’t really need all that much more memory. Unfortunately as with any dual-channel memory architecture, you’re fairly limited in how you can increase memory capacity and still get peak performance. Apple’s only move here would be to go to 2GB, which understandably comes with both power and financial costs. The former is a bigger concern for the iPhone 5s, but on the iPad Air I would’ve expected a transition sooner rather than later.

Although things seem to have improved with iOS 7.0.3, the 64-bit builds of the OS still seem to run into stability issues more frequently than their 32-bit counterparts. I still see low memory errors associated with any crashes. It could just be that the move to 64-bit applications (and associated memory pressure) is putting more stress on iOS’ memory management routines, which in turn exposes some weaknesses. The iPad Air crashed a couple of times on me (3 times total during the past week), but no where near as much as earlier devices running iOS 7.0.1.

Battery Life Final Words
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  • stevenvmc - Friday, November 1, 2013 - link

    Yes, it is a deal breaker for me. I'm using iPad 4 with 1GB RAM and it keeps getting low memory. When I open several tabs in Safari (5-6 tabs), when switching among the tabs Safari will refresh the content which will cost data bandwidth if on 4G. And the thing is they may release another iPad Air with 2GB RAM in 6 months. Reply
  • Desplow - Thursday, October 31, 2013 - link

    I still think the most significant iPad upgrade was the iPad 3 with retina display. Reply
  • jelloboy - Saturday, November 2, 2013 - link

    I had the original iPad, the iPad 2 and the iPad 3 and now the Air. I will completely agree with the review - in your hand this is a HUGE upgrade over the 3. On paper it's not overly impressive, but it's something you have to hold to really appreciate it. I was on the fence about getting the Air but decided to go ahead and get one today after reading this review last night. I'm very impressed with the Air - I'd say got and see one yourself and then see what you think.

    Also the iPad 2 might have been the biggest upgrade - the speed difference between that and the first was greatly needed. By the time I got rid of my original iPad for an iPad 2 I was ready to throw the thing through a window because it just seemed so laggy. The iPad 3 obviously had the Retina screen, but basically is an iPad 2 in terms of performance. That's my opinion anyways.
    Reply
  • shermanx - Thursday, October 31, 2013 - link

    when is the MBP review coming out? really curious whether this time Apple has fixed the ghosting for Retina screens, which is not really mentioned in reviews available now. Reply
  • LittleB69 - Friday, November 1, 2013 - link

    Great so this time they got it right!

    So now it runs Java and Flash without problems and can have other browsers installed that are not based on the safari rotkit. Support for more codecs, IR blaster for remote control, USB and NFC support and ....... or did they just make a thinner faster product with the same functionality as all the other devices?
    Reply
  • Charles K - Friday, November 1, 2013 - link

    Hello everyone, new here, sorry for the long (first) post and my english.

    I just wanted to say: I just bought the iPad air this morning after returning my nexus 7.2 for having a horrible aspect ratio, google asking for all my information in every app and just general lagginess.
    Don't get me wrong, the device itself is fast, but there is a lot of input lag, and little freezes all the time when using chrome or just when navigating the play store. I had gotten it because it was definitely cheaper, but the device even crashed a few times in less than two days, and coming from the iPad Mini (which I absolutely loved but gave my girlfriend), this just won't do.

    So now I figure, let's just shell out the extra cash and get the new iPad Air. I get the 16Gb "space gray", which looks much, much better on the iPhone, but still a beautifull device.
    I fire it up, play a bit with it and boom, (first-world) problems.

    There is a lot of screen input lag. I can't say precisely but definitely at least 100ms.It's still pretty fast, but using the tablet mainly for drawing and internet browsing, it really bothers me on such an expensive device.

    My question is: I really didn't feel input lag to be that slow on the iPad Mini, and I don't know if it's due to the much higher resolution, or just iOS 7 itself, buit does anyone feel it too, and do you think it could be adressed by a future software update? Because i'm thinking of returning the device and just get another iPad Mini without retina display. I don't reaaally need the extra power and resolution, and size/weight is really what's more important to me. That and speed (not power if it makes sense)

    Thank y'all, and great review Anan!!
    Reply
  • ADGrant - Saturday, November 2, 2013 - link

    If size and weight are your priority then you should get a Mini.

    As for lag, I haven't experienced any though I don't do much drawing. However, there is not a faster ARM tablet on the market and iOS has been measured as having much lower screen lag than Android.
    Reply
  • Ken Esq - Friday, November 1, 2013 - link

    I think Apple did a great job of cutting the weight down. Unfortunately, no matter how good their hardware is it's strangled by the overly simplistic iOS. I wish I could run Android or Win 8 on the iPad hardware. Reply
  • Ken Esq - Friday, November 1, 2013 - link

    Although...it would be nice if reviewers made it very clear that Apple does not supply a GPS chip on any of the WiFi only iPads. I guess they save themselves a few cents. Reply
  • beggerking@yahoo.com - Saturday, November 2, 2013 - link

    There are tons of tablets running full windows 8 for much less and work much better.

    Asus t100
    Surface pro
    Dell venue 8
    Reply

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