1 Reply Latest reply: Nov 11, 2012 9:09 AM by Barry
Flo_Sch Level 1 Level 1 (0 points)

Hello community!

I have this problem since I updated my MB Pro to Mountain Lion. Everytime I start using Numbers (latest version), the fan of my Laptop goes on and the running time of my battery drops to 1 1/2 hours. My MacBook also gets really warm. Everything seems that Numbers is not running really efficiently on my Laptop. That makes it hard to follow an entire lecture and it's really annoying for me and my classmates; because of this issue I currently use Excel instead.

I have a MacBook Pro late 2012 with the 2.7 GHz i7, 4 GB Ram and OS X 10.8.2.


I don't experience those problems when I'm using pages or keynote.


Does anyone have the same problem? Are there any suggestions?

MacBook Pro, OS X Mountain Lion (10.8.2)
  • Barry Level 7 Level 7 (29,460 points)

    This issue was first noted here around the beginning of August, 2012. See this thread, but don't take the reply marked "solved" too seriously—it turned out to be premature.


    Briefly, the issue is that Numbers consumes about 70% of available CPU time/activity whenever the mouse pointer is on a table. That CPU usage consumes power, creates heat, and activates the fans.


    No solution as yet. A summary of suggestions:


    File a bug report (Numbers menu > Provide Numbers Feedback)

    If you're near an Apple Store, take the MBP to the Genius Bar and demonstrate the issue using your machine (or any 2012 MBP with Numbers installed).

    Move the mouse pointer off any table whenever possible.


    Check the thread for any I've missed.