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  • paulfrommenlo park Level 1 (0 points)

    I have same problem. The culprit is Firefox (even the latest version 5.0.1).


    Activity Monitor shows that Firefox is utilizing 99-100% fo the CPU.


    The CPU util, fan, etc. calm down immediately as soon as I close Firefox.


    So, I moved all my bookmarks over to Chrome and am avoiding Firefox right now until they have a fix.


    BTW, I don't know what the deal is with Firefox. We had major problem when they upgraded to 4.0. We gave it up for a while and just came back to it a month ago. Upgrade to Lion and experienced this problem. Upgraded FF to 5.0.1 and it doesn't help.


    Chrome and Safari works perfectly fine with Lion.

  • Jim McDonough Level 1 (30 points)

    I'm afraid my experience is different.


    Until I got rid of the Microsoft Office indexing plugin for Spotlight, 2 of our computers ran hot just sitting there doing nothing.  Having solved that problem, I find that if I use Safari for very long, a process called Safari Web Content grows and grows, and the machine runs hot.  Close out Safari for a while and it will cool off again.


    I have not had problems with Firefox unless, of course, it invokes the dreaded Flash.

  • paulfrommenlo park Level 1 (0 points)

    Thanks Jim. May be I better leave Activity Monitor running to see if anything else is going on.


    But for the last 2 days, Firefox seems to be the only mis-behaving app in my system. I guess it's highly dependent on the browser extensions, but I just don't have the time to troubleshoot each extension one at a time...

  • Advanced User Level 4 (1,090 points)

    The same here. MBP 15 Early 2008. Fans are crazy and the Macbook gets really hot... Please Apple release a update to fix this as soon as possible! Another thing: the battery (which I recently replaced) isn't performing as good as with Snow Leopard...

    On the other hand, speed issues are gone after several restarts.

  • szuting Level 1 (0 points)

    mine was 2011 MBP, had same problem, no crix, I spoke to Apple support, they told me this isse has been report by the others too, they told me to delete the flash play and re-install again, but it didnt help.........

  • davidhubler Level 1 (0 points)

    I had the same issue. My problem was being caused by Carbonnite. Paused the backup process and I've got a happy MBP.

  • calg Level 1 (0 points)

    Same issue here! MacBook Pro Mid 2011... get's hot as **** with Lion

  • SpankR Level 1 (0 points)

    MacBook Late 2008- I have this issue... Man, does it ever get hot! I honestly can't remember even hearing the fan prior to upgrading to Lion. Now it gets too hot to touch the underside and the battery drains in about an hour...

  • Taipan10 Level 1 (0 points)

    I took off net barrier and that seemed to help
    Also think there is an issue with safari and flash and will take that off when i find it

    coolest temperature is now 50 or 60 if working hard
    The battery life is still nuked with 4 hours for a full charge compared with
    8 hours before
    Update *****

  • XRogue101789 Level 1 (0 points)

    I had to take out by battery on my mid-2007 black Macbook because of swelling, and am now running on MagSafe power. But I noticed something peculiar. The base temperature of my computer stays high, and Flash player and other resource hogs take up 90% of my processor, but the temperature doesn't go over 155 degrees F. Hopefully this helps some people who can take the battery out, although it does come with its own risks. I do think that the swelling has definitely accelerated since I upgraded to Lion.

  • Bat9th Level 1 (15 points)

    Has there been any progress in finiding out whats going on?


    I have a mid-10 13" MacBook Pro.. and it gets **** hot. Doesn't show any particular program running at a high amount. Even when at %98 idle.. It is hot.


    I am getting frustrated. Ofcourse my warrentey ended June 25th.

  • Oyinko2 Level 1 (0 points)

    I made some test to try to understand what's is going on with OSX Lion.


    On snow leopard, while browsing with only Safari opened, the CPU A is arount 40-45° celcius.


    On OSX Lion, the same usage put the cpu around 55° celcius.


    it's 10° more for osx lion!

  • SpankR Level 1 (0 points)

    As an update to my "me too" posting, I have resolved my overheating issues after installing Lion on my "Late 2008 MacBook"


    I used Activity Monitor (In the Utilities folder) to see what processes were running in the backgrouund. I found a few processes that were related to older software I wasn't using (and had uninstalled) and one in particular, that, while I used it occasionally, seemed to be the culprit:




    It used some CPU but a LOT of memory.


    Deleting anything gpg (Gnu Privacy Guard) related in the /Library/LaunchAgents and /Library/LaunchDaemons folders seemed to do the trick.


    I aldo noticed that Google software updater was running as a backfround process and took up some resources (CPU) soI unstalled it and prevented it from being reinstalled using the instructions here: on-os-x/


    My fan no longer runs at all, my battery lasts as long as usual, and it doesn't get hot!


    In the future: is a useful utility I am using to uninstall apps along with their associated files in places that are difficult to find.

  • kevindeleon Level 1 (0 points)

    Same problem here.  Firefox 5.0.1 and I have been unable to pinpoint exactly what is causing it.  Everything will be going fine, and then bam.. 110% CPU usage, case blazing hot, and fans trying to keep up.  Even after closing all tabs, the problem persists...Firefox must completely be shutdown and restarted.  Really hope they fix this soon.

  • nassosdim Level 1 (0 points)

    Same issue here. Macbook pro 13'' which I bought last summer and right after the latest 1.7.1 update it began getting as warm as 80 Celsius degrees with only dropbox and cloudapp running.


    So I did a format.


    Back to Snow Leopard for almost a whole day everything went typical. Temperatures hardly 50 when idle, clean install. Right afterwards I install Lion again. 1.7 works ok. Went 1.7.1 update and boom! Recurring hotness! Now I'll reinstall Lion alone and doublecheck if this is really a problem with 1.7.1 on my model and post back with the results (if not edit).