Android JS perf is somewhat less relevant since we switched to a raw vdom renderer in 1.5 final for the topic page and the header, which provides 6x-8x the performance on slower Android devices over Ember.
The OnePlus 3 is a great device! Still, it will be nice to see if Android can close the considerable JS performance gap in 2017, with whatever new CPUs are coming out, perhaps Snapdragon 830?