Bluetooth performance worse after Yosemite update
This looks like a bug in Yosemite. I have this issue and other people have it also.

I think we can just wait until it is fixed or return to Mavericks. I have tried resetting SMC and some other "fixes" from the internet without success.

OS 10.10.1 Yosemite has Bluetooth Audio Delay (lag, latency)