Page in/Page out high ratio, while lots of Free Ram unused

Discussion in 'Mac OS X Lion (10.7)' started by David3nk0, Aug 28, 2011.

  1. David3nk0 macrumors newbie

    Aug 28, 2011
    I posted the same thread on a different forum, so I'll just copy the text:

    Firstly, I would like to praise the community of this forum for all the advice and information I have received whilst researching solutions for my many issues over the years. I have always been able to resolve the problems through such research, yet in this case, I find myself in a stalemate.

    Anyway, my problem is as follows:
    I own a MacBook Pro 13" mid 2010 (2.4Ghz, 4Gb Ram), running Lion (Clean install), and whenever I use apps that are CPU and RAM-heavy, the system feels really sluggish and turns the mouse pointer into the beach ball more often than I care to endure. I started to investigate inside Activity Monitor and found the Page Ins/Page outs ratio to be alarming, up to 50% at times. Reading up on this issue over the internet I found people advocating Memory upgrade, if one ever experiences the ratio exceeding 10%.
    Though, what I find most peculiar is the fact that during my extensive use of the CPU or Memory, the amount of Free Ram almost never drops below 2Gb, the all-time low being 1,65Gb. My first question is: why doesn't the OS use up all of the available memory when in need?
    Since I'm seriously considering upgrading memory, I find myself on the fence about such action, because I don't know if it will serve the desired effect I'm looking for (reduce the ratio and improve multitasking)?
    Would replacing the current HDD with a faster one also improve performance?
  2. anti-win macrumors newbie

    Feb 5, 2006

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