A Cardboard Performance Problem

I selected Sony Z1, HTC E9+ and Redmi Note2 for Cardboard App performance test. Before this test, I supposed the Cardboard App could get the good performance on HTC E9+ (it has a high score on Performance Benchmark). As below test result, HTC E9+ had the worst result of this test!!!! Does anyone have suggestion for this test result? What's the major factor for the Cardboard App Performance? ----------------------------- Test App Description: Mojing:(Chinese VR App) http://mj.mojing.cn/ VideoTheater: This App is implemented by myself. SimpleVideo Player(a Unity App): Create a simple VR secne and play a video inside it VerySimple VR App (a Unity App): Same as "SimpleVideo Player" but remove the video player Cardboard Example App@Unity: Download from Cardboard Developer Web. Cardboard Example App@Android: Download from Cardboard Developer Web. Thanks, Tony