download opera beta for android and go to opera://flags

here is a setting that gets rid of a major annoyance of html5.
disable gesture requirement for media playback enable this

If you find opera is not as fast as chrome, you can do this
enable override software rendering list for old gpus once it was used my gpu performance increased dramatically(this was for a game that is as resource intensive as kingdom hearts the islands)

you can also set the default tile width and height to 128.(although I’m not sure if this is helpful.)
this probably wouldn’t help on games with large textures, but I set the tile compression method to eventually