[Milhouse]

Thanks Milhouse - good detective work as usual.
I suspect reverting the offending commit, could help audio playback cpu, but is likely to harm video playback cpu.
I've pinged @FernetMenta who may be able to help find a fix for both.

I've re-built #0409, and reverted PR6898, but it hasn't had any effect on the high CPU load (which is still there) so I'm going to have to go back to #0304 and review what the hell is going on and which commit is responsible - building with and without the "test" commit confirmed it to be the cause in #0304, but removing this same commit from later builds is having no effect, which is frustrating.