116 responses

  1. wayne
    January 5, 2006

    I just received this by email,
    look at how high the page in/out count it!


    Time for memory upgrade!

    • HaWook
      July 12, 2010

      My Page ins and Page outs are expressed in megabytes (960 and 325, respectively). How can I figure out the actual number?

      Please and thank you.

    • Andrew
      December 26, 2010

      The blue section reads ‘Inactive’ for a reason. A program has claimed it, but is not using it. Your mac should page these out because it is essentially empty space. Windows does this as well, its called scrubbing.

      Want proof, go to the apple store and run Activity monitor on one of the showroom macs. There will be tons of page outs despite the fact these macs only have the programs that come with your mac (and your mac was designed to handle without slow downs).

      This is Apple marketing bull trying to make you pay $400 for overpriced RAM. Get iFreeMem and see what I mean, this will page out all inactive memory, essentially turning all your blue memory green and speeding up your Mac.

      • Anna
        June 12, 2011

        Thank you Andrew. I’ve had a ‘start up disk almost full message’ for the last few days, and my laptop is very slow opening things. Yesterday it couldn’t start and showed a flashing question mark instead. I’ve got it started & running now (with help from the installation CD), but that was a great worry and wonder if the lack of space is stuffing up hard disk (=startup disk) somehow.

        I’ve got somewhere between 8 and 45 MB free memory on System Memory in Activity Monitor, fluctuating up and down. I’ve got about 233 MB inactive memory, and the pages out is slowly climbing up, currently about 420 MB. In disk usage I’ve got about 12 GB free and about 99 GB utilised.

        So I wonder if paging out the inactive memory can help, I’ll give iFreeMem a try.

        Ps. I can see that the Chrome browser appears to occupy a massive amount of working memory, does anyone else have that experience?
        It does also frequently crash, which could be because I am in the habit of having too many tabs open at once.

      • Anna
        June 12, 2011

        Follow up: I downloaded and ran iFreeMem. It doesn’t make a difference and doesn’t tell me anything that Activity Monitor doesn’t already show. Also, it is just a 15 days trial of a paid product and whenever you start it up you have to select to ‘continue trialling’ – slightly annoying.

        Re. the inactive memory, I found below in another forum:

        “don’t worry about that “inactive” ram, that’s as good as “free”. it means that osx has at some point loaded something in the ram and later on decided that it is no longer needed. of course the ram could be “freed” (completely) but unix systems have made such a decision that the content is kept in the memory in case it is needed in the future. but because that memory is flagged as “inactive”, it can be deleted as soon as some other app needs to have that memory. so it is just one kind of an optimization- .” –
        ( JFreak in http://forums.macrumors.com/showthread.php?t=73631 )

        Makes sense.

      • Rod
        June 6, 2014

        Operating systems (not only Unix systems such as OS X) currently cannot return RAM to the system pool, where it can be used by an application, until the application is exited. I’m not sure of the reason for this, but it appears to be a technical one.

        When an app needs more RAM, it first looks in its own pool, that is, RAM it used and released. If it doesn’t find enough RAM, it takes more from the system pool.

        This means an app ties up the maximum amount of RAM it has needed since it last opened. If you’re running out RAM, exit and re-enter the app(s) that are using the most. It’s also wise to avoid opening too many documents in the same app. I have a friend who opens 20 or more tabs in Firefox and never closes one when he’s done with it.

  2. Patrick
    August 10, 2007

    I was googling around to see what excessive paging was as I was worried my mac was on the high side. After 1 day my Page in/outs are at 1376201/486790. Time for a MacPro since I’m already at the 2GB limit on my CD iMac. *Yikes*

  3. Brent
    August 1, 2008

    Well my page ins/outs count is also very high along with having only 18MB of free memory. I had running Finder, Firefox, Microsoft Word, Preview, Safari, and Activity Monitor. I tried closing Word, Preview, and Safari and now it is up to around 180MB free. Now my question is this…lately I’ve been having slow-downs alot and my computer will freeze for a few seconds and I get the beachball. This happens even after a reboot with only Firefox (and sometimes one more program open). Should I get more memory? If so, how do I know what kind to get. I’m a newbie to the MacBook and OSX.


  4. admin
    August 5, 2008

    If it is slow straight after a reboot, and there are no page ins, and there is lots of free memory still, then the slow-down is probably not a memory problem, unless you have Leopard, it needs lots of memory, like 2 Gig at least.

  5. stuart
    September 13, 2008


    I have also been noticing that my computer lately, slows down alot. Usually, I run Mail, iTunes, Safari, Newsfire, Adium and maybe sometimes transmission. I notice that my page in’s and out’s are quite high. Just yesterday it was the highest that I have ever seen. Today I rebooted and immediately after reboot my page ins were 45,023.

    I am at a loss on what to do. Alot of times my page outs exceed my page ins after a day of running.

    Please help

  6. stuart
    September 21, 2008

    Hello again, I just wanted to give an update. I rebooted last night before I went to bed. Again right after start up I has an extreme amount of page in’s. Similar to my above comment. Now less the 16hrs later I now have this
    Swap 2.01GB(3.00GB)
    Page in: 157,558
    Page out: 273,764

    I really am having a hard time grasping what is actually wrong since I have not had this problem until just recently. My warranty is not yet finished for my iMac.

    Please help shed a light on this for me.

    Kind regards,


  7. Drew
    September 21, 2008

    @ Stuart,
    If your mac is restarted & not running any apps and you are getting page ins/outs make sure there are no applications running in the background such as iTunes helper, iCal helper menu items dashboard widgets third party apps…
    They should be listed in the activity monitor window.

    It could just be the load that the OS places on your system. You may need more RAM, just keep an eye on the amount of paging and contact Applecare if it concerns you. You don’t say what version of Mac OS or the amount of RAM you have, but more should help. 2 – 4 GB should keep it running smoothly for basic tasks.

    PS the Leopard Activity Monitor specifies the paging in MB/GB units, Im unsure if the units are Kb, MB or GB in your comment.

    Nice article, it helps clarify what is going on with memory.

  8. admin
    September 21, 2008

    how much RAM do you have?
    Have you recently upgraded to Leopard?


  9. George
    October 13, 2008

    MacBook (Generation 3)
    1GB RAM

    Free: 11.52MB
    Page in: 1218997
    Page Out: 736528

    Page in/Page out are increasing when I went to a website on FireFox.

    Applications in use:

    Microsoft Word
    Activity Monitor

    I also use a lot of Photoshop, iMovie and iPhoto.

    For me, it always seems like FireFox that is creating the whole mess. But I need it because of it’s tools that Safari doesnt have.

    But my main question is obviously, Do I Need More RAM??

  10. sarah
    March 9, 2009

    My computer is super slow! My page in/outs are: 74840/25909 and ‘ins’ keep going up. Also the Free is 80 MBs. I just rebooted too? Reboot again? I was just running word and excel and I’m soooo frustrated.

  11. Ben D.
    April 16, 2009

    “Free tells you how much free memory you currently have, the higher the better”.

    Actually you should never expect “free” to be high. See this article from Apple for more information: http://support.apple.com/kb/HT1342?viewlocale=en_US

  12. Dunwell
    August 17, 2009

    recently, I deleted some file and my ibook G4 wouldnt boot. I rebooted it with “Leopard” (it was Tiger before). now it is so slow I have towait onit to open some firefox pages. It is even doing things I didnt comand it to do.
    I have 512ram 1.33 processor and 60G HD. what can I do?

  13. juelz
    September 17, 2009

    I am confused because from your comments it seems as if my system isn’t doing what it is supposed to- my page in is 258.08 and increasing but my page outs is 0 and swap used is 0- is this good or bad? I have 1.04 memory used out of 2 GB but it seems as if an update im trying t o get for my microsoft office is not letting me download because of lack of memory. I am quite confused at this point

    • Athena
      March 30, 2010

      Page ins SHOULD increase with every file you open – they occur when data is loaded into RAM.

      Page outs occur when you run out of RAM to be used.

      If your page outs are 0, that’s great! I’d say your download is failing for a reason other than RAM – perhaps hard drive space?

  14. bamakodaker
    February 22, 2010

    I wonder if everyone is forgetting something very simple – what about HOW RAM is used? Is your desktop crowded with items using up that RAM? Keep everything IN your harddrive. ONLY have ALIAS’ on your desktop!~ Keep that RAM free.

    • admin
      February 22, 2010

      The items on your desktop are still on your harddrive, not in RAM.
      RAM is the memory in your computer where things are loaded when you open them up.

  15. Aayush
    March 22, 2010


    I have been noticing that my computer lately, slows down alot. Usually, I run Mail, iTunes, Safari/firefox (though safari makes it more slow), word and excel. I notice that my page in’s and out’s are quite high. Today I rebooted and immediately after reboot my page ins were 36,458.

    I am at a loss on what to do. Alot of times my page outs exceed my page ins after a day of running.

    I have a macbook 2.2Ghz core 2 duo with 1GB RAM and recently upgraded to snow leopard.

    I never faced this problem earlier, although i started having the problem in my leopard only thats why i upgraded to snow leopard.

    Please help

    • admin
      March 23, 2010

      1 G ram definitely not enough for Snow Leopard, at LEAST 2 Gig preferably 4.

  16. Aayush
    March 23, 2010

    will upgrade and try it out…………..thanks………….

  17. Eve
    April 11, 2010

    Cheers for that, helped a lot.

  18. Zev
    May 7, 2010

    my mac is slow i got 2 gigs of ram mostly use imovie ichat itunes and itenternet and windows,

  19. Nabeel Khan
    May 30, 2010

    does anybody know what the conversion is for page ins & outs from Mb’s to just the large numbers you all have showing in your activity monitor?
    Mine shows the amount only in megabytes


  20. HaWook
    July 12, 2010

    My Page ins and Page outs are expressed in megabytes (960 and 325, respectively). How can I figure out the actual number?

  21. Roman
    July 21, 2010

    Thanks for sharing, guys. Now I’m sure I need to upgrade with no doubts!

  22. charlie
    July 28, 2010

    I have a imac osx 10.4.11 (so about 5 years old i think) it has a 2GHz intel core duo and a 1GB 667 MHz.

    When i run the folllowing I have 70MB free and 87660 page in and 43569 page out. Things get slow.


    what im wondering is, is it worth me buying more memory or is my mac reaching the end of its life.i have been told by 2 people that they only have about 5 years in them.
    also if i move my iphoto library(and my lge amount of saved psd documents) onto an external then will this have any effect on the ram or is that totally seperate.
    any advice would be gteat.thankyou!!!

  23. Sanjay
    September 5, 2010

    I liked the discussion here. My MAC is also 660 Mhz Intel dual core with 1 GB RAM. It has also gone very slow and I was thinking of upgrading to Snow leopard. It seems that is not the solution. My activity monitor shows just 7 GB free when just 4 programs are running (no video or iTunes) and also the page ins are 276 MB. Is this page on per session or year till date? One observation in activity monitor: pmtool and kernel_task (root) have sent more than a million messages (under messages sent). Anybody has any idea why?

  24. Matt
    October 3, 2010
    • admin
      October 4, 2010

      That’s fine, you have a fair bit of free memory and your page out is very low. That’s good. Don’t worry about VM size or Page ins.

  25. milo
    October 5, 2010

    my g4 mac won’t even open the “activity monitor”! the icon pops up but disappears straight away. Doesn’t see the additional internal hard drive either ,not on the desktop. In the system profiler it appears ,but grey!

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