Not only its laggy but it's always auto closes as well. Using iOS 9.1 on both iPhone 6 and iPad Mini. Reported this to GM a few weeks ago. But no action taken till today.
9a8b7c6e replied at 2015-12-23 00:39
Yes and wont install even already remove existing installer
Thank you for your reply. The information is really helpful.
It shows that the APK works for most models of SM devices especially mobile phone. But the APK seems not suitable for your model now. Maybe you could try other device.