On my Android Phone ( 4.1, Galaxy S2 ) the demos ran very quickly on the stable version of Firefox, but the stable version of Chrome struggled greatly until I enabled webgl in about:flags.
Even with webgl enabled, Chrome was still a bit slower than Firefox on the bunnies demo.
The flashvhtml site and game that was posted here a while ago also uses pixi.js. http://flashvhtml.com/
The html5 version of the game there runs very well on both Firefox and Chrome with webgl enabled on Android.
There were still obvious hiccups attributable to the GC. Most of the time the game was going a full 60hz.