I currently use bluetooth headphones (MEElectronics Matrix2, for those wondering) on 10.11 and there are often problems of audio "skipping" when I am also using my Magic Trackpad & wireless Apple keyboard. It seems that OS X has problems dealing with that much bluetooth bandwidth/activity at once; it doesn't lose the connection/pairing entirely but just skips out for half a second, frequently. Anyway, I'm just curious, for those of you who are testing out the macOS beta, has you noticed improvements or changes in bluetooth audio?