Mobile App Performance Redux

Testing setup

  • Apple iPad Air 2 / iOS 8.2
  • Apple iPhone 6 / iOS 8.2
  • HTC Nexus 9 (2014) / Android 5.0.1
  • Motorola Moto X (2014) / Android 5.0
  • Xcode 6.3 beta 3(6D532l)
  • Android Studio 1.1.0
  • RoboVM 1.0 (
  • RubyMotion 3.6
  • Xamarin Studio 5.8 (Xamarin.iOS / Xamarin.Android
  • J2ObjC
  • Titanium Studio / Titanium SDK 3.5.0

The Results

  • Xamarin crushes my benchmark and is (no longer) the king of the hill. At over 30% quicker than Objective-C, I find it hard to find a reason not to use it. An eagle-eye will remember there is a big difference between this result and the result from my original post. @migueldeicaza pointed out I should not be using DateTime.UtcNow since it has performance limitations. It turns out I had some cruft so I took it out, and this was the result. The performance is so great that I have to imagine there is some magic involved.
  • With the addition of Objective-C, we see that J2ObjC does a pretty good job of transpiling the Java code to Objective-C with only a 10% performance hit. When Swift is added to the picture, both the Objective-C and J2ObjC hybrid apps perform the same. This leads me to conclude the Swift bridge overhead was pretty significant.
  • RoboVM has been officially released, and the performance is still outstanding, especially since I can compare it against Objective-C. I just really wished they supported Xcode storyboards.
  • Of course, Safari and WKWebView exhibit about the same performance, and it is clear that Apple did some work to improve their JavaScript engine since both of those outperform Chrome and Titanium. The most telling observation from the JavaScript apps is how well they all performed relative to RubyMotion. RubyMotion is compiled down to ARM bytecode, and it still cannot compete.
  • I find it a little weird that the Android WebView app perform so differently than Chrome on Android. I assume that both would have the same JavaScript engine, but it appears that they do not.

Update 3/17/15 9pm

Update 3/19/15 3pm

Update 3/22/15 5pm

Update 3/23/15 10am




Former Googler, Pseudo-hacker, Frozen waffle master

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Harry Cheung

Harry Cheung

Former Googler, Pseudo-hacker, Frozen waffle master

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