We have a discourse forum for our sports site ( ) and many of our writers have been complaining about poor performance of the forum on their older android phones. I love my phone (Moto X 2014) and much prefer Android to iOS but as JS apps are becoming more ubiquitous we’re almost at the point where a (personally) inferior experience on the rest of the device is worth the trade off to have the sites I use and love work well. This is getting really frustrating for me personally, not just from a developer standpoint but from a consumer standpoint. Part of it is indeed Chrome/V8 JavaScript optimization issues on Android as you can see from this AnandTech Galaxy S6 review. We’ve done enough research to know this issue is not really specific to Ember, but also affects Angular and most other heavy/complex JavaScript on Android. In a nutshell, the fastest known Android device available today – and there are millions of Android devices much slower than that out there – performs 5× slower than a new iPhone 6s, and a little worse than a 2012 era iPhone 5 in Ember. That doesn’t seem too bad until you compare… This is the benchmark most representative of Discourse performance, and the absolute best known Android score for this benchmark is right at ~400ms on a Samsung Galaxy S6. ![]() To give you an idea of how divergent it has become, try: For several years now we’ve tracked the fact that, over time from 2012 onward, Android JavaScript performance has become wildly divergent from iOS JavaScript performance.
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