I've tried to play the game in Chrome. It is pretty fast but very - I do not know how to describe it in English - jumpily or shakily which does not do good for the eyes after some time. Jelly, in turn, which is based on Android WebView is able to render the game smoothly without jumps but is a bit slower than on Chrome.
I am certain that you can tweak Chrome somehow to render the games better on older phones. I played with some flags (GPU flags and so on) but could not achieve any improvement. Do you have any ideas?