Previous 1 2 3 Next 35 Replies Latest reply: Mar 23, 2012 9:25 AM by GamePlayInc
Ryan Homer Level 1 (95 points)

Just got a new MacBook Pro with OS X Lion and updated to 10.7.1. I've seen the BTServer process cause high CPU utilization twice now. One morning I also noticed that the fan was running loudly while the lid was closed and the computer was locked up; I had to force power it off. Anyone seeing similar issues? Doing a search for BTServer on Google or even here in the Apple Support Communities does not bring up anything related to Lion at all, only iPhone-related articles.

MacBook Pro, Mac OS X (10.7), 2.3GHz Intel Core i7, 8GB 1.3GHz
  • timmysf Level 1 (10 points)

    yup, i had this problem too.  i have a new 2.2ghz macbook pro and while at a coffee shop, i noticed my battery draining very quickly, and a look at activity monitor showed that BTServer was running away with high-cpu utilization.    i killed off the process and didn't notice any loss of functionality. 


    not sure what it was supposed to do with so much freaking cpu cycles!!!


    is this for bluetooth? i dont even have bluetooth on.  im not happy about this having to be something i'd need to keep a eye on when i'm trying to maximize my battery life. 

  • timmysf Level 1 (10 points)

    okay, follow up here - looks like BTServer is launched when I have the ipad simulator running when doing xcode work.  quitting the simulator will also end the process.


    might be a necessary service for the ipad simulator, but whoa.. lets take it easy on the cpu, mmkay? 

  • Starmaster88 Level 1 (5 points)

    I'm having this same probem myself on a new MacBook Air running 10.7.1. I'm a developer as well, so that makes sense if it has something to do with the iOS Simulator. Hopefully Apple will update the software soon to fix this problem. In the meantime, I've just been using Activity Monitor to quit the BTServer process. My fan slows down right away when I do.

  • ThePablick Level 1 (5 points)

    I also noticed this issue a short while ago. But with a slight difference from what some of the guys above wrote – iPad simulator was already shut down almost 6 hours ago, and since then the MacBook has been sleeping until now.

  • pierangelo_swp Level 1 (0 points)

    I don't think it has anything to do with Lion. I'm having the exact same problem under Snow Leopard 10.6.8


    I think it is something in recent betas of iOS5.


    I'm a developer too, and this problem only appears when I leave the iOS simulator open (if unused).



  • viewplus Level 1 (0 points)

    Just confirming I have this issue, too. And that killing BTServer works.


    I have noticed this since installing Xcode 4.2 w/iOS 5 beta 6. It has occurred on a MacBook Pro running Snow Leopard and a MacBook Air running Lion, so it seems OS-independant. Also, the iOS simulator is not necessarily running at the time of high CPU usage, but has been launched since rebooting. Sometimes, simply relaunching the simulator does the trick.


    Cool down, little Air, coooool down.

  • elguanodev Level 1 (0 points)

    I recently noticed the same issue, and a lot of the supporting details match - dev working a late build (aug 2011) xcode 4.2, running iOS simulator. BTServer doesn't always start going crazy, but on my 2010 macbook air it will occasionally start taking up 150-170% cpu in activity monitor, and I'd kill the process to good effect.


    Tried quitting iOS simulator and that does the trick as well. I just wish there was a way I'd get notification that it's going crazy sooner than waiting for the fan to start ramping up and the battery draining.

  • Starmaster88 Level 1 (5 points)

    Xcode Developer Preview 4.2 Beta 7 fixed the problem for me.

  • kylefromcolumbia Level 1 (0 points)

    Just had this problem, and I have indeed launched the iPad simulator since rebooting my machine. I was doing some coding work in the morning, went to lunch and had some meetings, came back to find my machine running at 97º C (!!) and the fans both raring away at 6,000 RPM. Killing btserver in the Activity Monitor quickly brought things back down to normal.


    I'm on 10.7.1 and Xcode Developer Preview 4.2 Beta 7.

  • joconor Level 1 (0 points)

    Just FYI: I'm seeing the problem with Snow Leopard 10.6.8 and Xcode DP 4.2 beta 7 (4c177)

  • Karlmax.Berlin Level 1 (0 points)

    Same problem here: high CPU load caused by the BTServer process even in Xcode 4.2 GM on Snow Leopard.


    The problem seems to always appear when waking up a MacBook from sleep with the Simulator left running.

  • PaulSlocum Level 1 (0 points)

    Same problem here on the official XCode 4.2 / iOS 5 release that came out yesterday.

  • alexfrombrooklyn Level 1 (0 points)

    Me too with XCode 4.2/iOS5 release.  Ironically makes iOS developing on the move - i.e. on a Macbook Pro using battery power - very inconvenient.  Battery life is ridiculously small when the simulator is running now.  Plus fan comes on within seconds in any situation.

  • iwacemaker Level 1 (0 points)

    Same here, 10.6.8 and official XCode 4.2.

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