WebGL Aquarium on a Nexus 7 runs very slowly; around 4fps. This jumps significantly if we flip the 16bpp pref (to 20+fps). This means one (or more) of these things is happening: - The driver/hardware is significantly slower at rendering into a 32bpp framebuffer than a 16bpp one. This is highly unlikely; at *worst* it should only be 2x slower due to memory bandwidth. - One of our copies somewhere is hitting a slow path (perhaps 32->16, etc.). - Something else dumb is going on. I'm reluctant to try to fix the second potential issue until bug 716859 lands though, but we need to track it.

It's running between 7 and 9 fps (50 fish) now on current Aurora and Android 4.2.1.

This is fixed by 716859.

Marking WFM based on comment 2.