System Performance

Since the state of benchmarking on Windows Phone is not as mature as Android, I haven’t been able to compare the Lumia 640 to the competition in every aspect that I would like to. What I have been able to do is put it through our standard browser benchmarks, along with BaseMark OS II to look at individual component performance, and GFXBench to examine GPU performance.

While the absolute performance of Snapdragon 400 is well known, certain aspects of performance are heavily impacted by a device’s software. A good example is browser performance, which is a function of both SoC power and the speed of a device’s browser and Javascript engine. Two devices with the same SoC can have very different browser performance.

Kraken 1.1 (Chrome/Safari/IE)

Google Octane v2  (Chrome/Safari/IE)

WebXPRT 2013 (Chrome/Safari/IE)

Unfortunately, it’s clear that Internet Explorer doesn’t measure up to Chrome and Safari when it comes to performance. While buyers may be pleased that their Lumia 640 performs as well as the more expensive Lumia 735, both of these phones occupy the lowest positions on every chart. There’s even a significant gap between them and other Snapdragon 400 devices running Android, such as Motorola’s Moto G.

Basemark OS II 2.0 - System

Basemark OS II 2.0 - Memory

Basemark OS II 2.0 - Graphics

Basemark OS II 2.0 - Web

Basemark OS II 2.0 - Overall

There's not much need to go into detail on the Lumia 640's performance in BaseMark OS II. With the exception of a fairly good result in the NAND memory test, the Lumia 640 achieves the lowest scores that we've seen in recent times.

Unfortunately, the Lumia 640 isn't shaping up to be a very quick device. It's consistently bested by Snapdragon 400 devices running Android, and in 2015 we're going to see Snapdragon 410 used as the SoC of choice in devices at this price bracket, which won't make the Lumia 640's position any better. Microsoft needs to iterate much quicker than they currently are. Their slow pace in adoption new hardware helped kill Windows Phone in the high end market, and it will do the same to the low end. I have some further words about performance on the Lumia 640 and Windows Phone in general, but those will have to wait until the software section of the review.

GPU Performance

The last area of performance to investigate is GPU performance. The performance of Adreno 305 has been thoroughly evaluated on Android, but differences in drivers and graphics APIs can improve or reduce performance across different operating systems.

Since Adreno 305 doesn’t support Direct3D feature level 10.0 and Shader Model 4.0 it’s unable to run the GFXBench 3.0 Manhattan test. This leaves us with only the T-Rex HD benchmark which isn’t very hard on high end devices, but still poses quite a challenge for weaker mobile GPUs.

GFXBench 3.0 T-Rex HD (Onscreen)GFXBench 3.0 T-Rex HD (Offscreen)

In both the on-screen and off-screen tests, the Lumia 640 lags behind the Moto G. While 1-2fps doesn’t seem like much, when your frame rate is in the low single digits it represents a significant difference in performance. Because of this, I decided to take a look at the performance in GFXBench’s driver overhead test to see what impact the GPU drivers and graphics API might have on performance.

GFXBench 3.0 Driver Overhead Test (Offscreen)

As suspected, there’s a very significant gap in performance when comparing the Lumia 640 to the Moto G. I can’t say whether this is due more to the differences between OpenGL and DirectX, or between the different Adreno drivers on Windows Phone and Android, but whatever the case may be the end result is a notable decrease in GPU performance on Windows Phone when compared to an Android device with the same SoC.

I’m not happy at all with the GPU performance that we see in low-end and even mid-range smartphones, and the Lumia 640 is no exception. There’s not much Microsoft can do here though, as moving to Snapdragon 410 with its Adreno 306 will not improve GPU performance at all. All I can really say is that users shouldn’t expect to be playing any 3D games on their Lumia 640, but simpler 2D games should run just fine.

Introduction and Design Display
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  • Cryio - Tuesday, June 9, 2015 - link

    Lumia 520 has a dual core Krait CPU. Much faster than a dual core SD200. Reply
  • testbug00 - Tuesday, June 9, 2015 - link

    yes, I forgot. My bad. Herp derp. Qualcomm's naming scheme is cr*p still. Reply
  • MrSpadge - Tuesday, June 9, 2015 - link

    The Krait is clocked at 1.0 GHz in the Lumia 520. It's pretty close in performance per clock to an A9, which itself is not much faster per clock than an A7. Overall 4 x A7 at 1.2 GHz is about as fast as 2 x Krait at 1.0 GHz for single threaded loads. Reply
  • StevoLincolnite - Wednesday, June 10, 2015 - link

    Got a Lumia 535 as secondary windows phone device (Got a Lumia 920 as my daily driver still - Dual-Core 1.5ghz Snapdragon S4, Adreno 225) which has a Quad-Core Snapdragon 200 and Adreno 302.

    Both run without stutter and run smoothly in everything... With one exception, Internet Explorer, but even that's perfectly passable.

    Even played with 520's, 525's, 610, 620, 630 phones and they have been fine... I would assume something must have been up with the reviewers device, one thing Windows Phone has always never had a problem with is fluidity.

    Microsoft needs a new high-end device, I need an excuse to upgrade my Lumia 920 which is years old now, the 930 simply wasn't it.
    Reply
  • Daniel Egger - Tuesday, June 9, 2015 - link

    I disagree. Performance is terrific on those devices, actually much better better than the much cited Moto E 2nd gen which requires a lot of tinkering to actually provide a comparable fluidity. Reply
  • tipoo - Wednesday, June 10, 2015 - link

    What tinkering did your Moto E need? My Moto G runs just fine. Reply
  • SirPerro - Monday, June 15, 2015 - link

    That's bullshitty at its best. Which "tinkering" is it required to make the Moto E fluid? (Answer: None) Reply
  • Frenetic Pony - Tuesday, June 9, 2015 - link

    You're thinking it's the same as Android, Windows Phone (or Windows for phones, or wtf ever they call it) has generally been a lot smoother on lower spec phones than Android. Reply
  • Frenetic Pony - Tuesday, June 9, 2015 - link

    You're thinking it's the same as Android, Windows Phone (or Windows for phones, or wtf ever they call it) has generally been a lot smoother on lower spec phones than Android. Reply
  • haukionkannel - Wednesday, June 10, 2015 - link

    Well I have Lumia 625 (slower phone than this) and it is very fine in navigation! So no problem in there! It is not good for gaming, but every other task is just fine with this phone. Reply

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