I use a Mid-2011 iMac 21.5" (with 4 users on it).

I have noticed that the computer is runs quite slow when I am the only one logged in. The only applications I typically have open at once are Xcode, Safari and occasionally some other applications such as Reminders and notes.

When I checked Activity monitor to see how much RAM it was using, I noticed it said it had used 3.97-3.99 out of the 4 GB of ram that it has (See Screenshot).

Memory Usage Screenshot

here is the cpu graph:

CPU Load Screenshot

I also ran EtreCheck as requested, however I was not expierencing the slowness as much when I ran it:


I will upload one when I experience slowness...

I am considering buying extra RAM but I wanted to make sure that this was actually the cause of the problem before investing in $100 RAM chips.

Would upgrading the RAM from 4 GB to maybe 8 or 16 GB fix the issue? If not, what would fix the issue? Is there anything else that needs fixing?

  • For me, a cure for "slow Yosemite syndrome" was to fix the user, group, and permissions on "/usr/local". For details, see my answer to apple.stackexchange.com/q/152044/113575 Commented Feb 13, 2015 at 13:16
  • it's not just Yosemite; I was noticing slowness when I had mavericks. But after I installed Yosemite, I noticed that the computer got a little faster... Commented Feb 13, 2015 at 14:20
  • We really need more information about your system to answer the question. Please download and run EtreCheck, past the results into a gist and update your question with a link. Commented Feb 14, 2015 at 0:18
  • @AlistairMcMillan done Commented Feb 14, 2015 at 14:22
  • @Developer_ACE Thanks for posting that. I'd look into getting rid of any of those plugins and extensions that you don't recognise, particularly the one that EtreCheck identifies as Adware. But, to my eyes, nothing particularly stands out from a performance standpoint in that EtreCheck scan. Although you can see that there was obviously a problem at some point in the last two days since various things were "killed due to memory pressure". Commented Feb 14, 2015 at 16:02

1 Answer 1


Nothing wrong with your Memory, but if you wish to upgrade do so.

The slow computer has other reason, so we need to see your full activity monitor to help you.

Here is a sample of my memory (at about same levels as yours) without slow computer part.

ram usage

  • why is your memory pressure graph green compared to mine? Commented Feb 13, 2015 at 2:56
  • yours is doing more work, you have already 1.2 Gig compressed while I have only 200 meg. Again, adding Memory will help but that is not the main reason for slowness.
    – Ruskes
    Commented Feb 13, 2015 at 3:16
  • What exactly is the compressed memory? What contribtes to it? How do I make it go down? Additionally, if I get, say 4 more GB of RAM, how much do you think it will help? Commented Feb 13, 2015 at 3:41
  • As your Mac approaches maximum memory capacity, OS X automatically compresses data from "inactive apps", making more memory available. Thus it is a indication you could use more memory, but still would like to help you with slow computer if you show me the CPU usage. As for how much more RAM, if you get 4 more it will last you for a while (a Year or 2) then you need more and so on :)
    – Ruskes
    Commented Feb 13, 2015 at 3:48
  • added CPU to original question... Commented Feb 13, 2015 at 3:59

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