There are two things to look at
Geekbench single core perf
General JS perf on the dominant browser on the platform
Unfortunately Android is in the doghouse on both at the moment, still, even in 2016. If you want to have a good cry, compare those numbers for iPhone 7, hell even the year old iPhone 6s, and literally anything in Android world.
The only real good news is Discourse 1.5 switched to vdom rendering on core pages, which was a solid 5x perf increase on Android, and Ember 2.10 looks 2x faster on Android, and we think we will be able to get to that version of Ember in this current 1.7 beta, and thus in the 1.7 release later this year.