Basically, this issue seems to have gone into limbo on google's end; they don't seem to have nailed down why decoding is taking so long, and there is no talk of trying to do what FF does (uses it's own decoder for ogg instead of the one built into android).
An audio-rich android game is basically off-the-books for now, because the load times would be utterly insane.
Ashley mentioned trying to integrate an ogg decoder into the C2 runtime; an asm.js implement should be nearly as fast as native, which would hopefully bring perf in line with firefox. But...there haven't been any updates on that.
I'll drop a new msg on the bug report to see if there are any updates.