I observed the same behaviour with an arale running rc-proposed (build 369 
today but earlier builds too). With the phone connected to a BT speaker (JBL 
Charge 3) and streaming music from the internet, I get frequent disconnections 
from either the internet stream or the speaker. 
Listening to the same streams with a wired headset works perfectly. 

I did the following speed tests measurement this morning:
1. Streaming + BT on, 5 runs
(kbps) 390, 794, 767, 618 and 455
avg: 604kbps

2. Steaming + BT off (loud speaker of the phone), 5 runs:
(Mbps) 8.26, 11.30, 11.33, 11.62 and 10.61
avg:  10.62Mbps

It is 17.6 times slower with BT on than off, and the reliability of the
internet and BT connections is really bad.

** Changed in: canonical-devices-system-image
       Status: New => Confirmed

** Summary changed:

- M10 wifi slows to a crawl when bluetooth is enabled
+ wifi slows to a crawl when bluetooth is enabled

** Changed in: canonical-devices-system-image
   Importance: Undecided => Critical

** Changed in: canonical-devices-system-image
    Milestone: None => 13

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https://bugs.launchpad.net/bugs/1598584

Title:
  wifi slows to a crawl when bluetooth is enabled

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