Preview eating all memory

Discussion in 'OS X Mavericks (10.9)' started by NunoBerny, Jan 28, 2014.

  1. NunoBerny macrumors regular


    Feb 12, 2012
    Lisbon, Portugal
    Is it just me or is Preview eating up all the memory when I try to edit photos?
    The system suddenly becomes very slow, with memory going "red".

    It happened with a few photos, most of them quite small in size.
  2. Lordart macrumors newbie


    Aug 20, 2014
    I've recently got a new Mini-quad 2.3 and have 16GB ram ... but have noticed the same as you... start editing a small 700kb photo in preview and wow does it gobble up the ram and then virtual memory... here is a small video.

    If anyone has a solution it would be very appreciated - on my old 24" white iMac with 3GB ram Preview was perfectly fine to edit much larger photos without any slowdown...

    Weird :confused:
  3. NoBoMac macrumors 68000

    Jul 1, 2014
    Not so weird. It's "saving" previous changes.

    Redo the experiment, up-to some point, then start doing Edit > Undos and watch the memory usage start ticking backward.

    Now, that said, I've noticed that iPhoto is bad at releasing memory, so wild guess here, Preview is sharing some of the same code for "Adjust Color..." and will be just as bad in not cleaning up after itself. So, will free up some of the used memory, probably won't get it all back. The more you work on, more memory will not be freed, so, good idea to maybe every now and then to quit/restart Preview.
  4. Lordart macrumors newbie


    Aug 20, 2014
    Thanks for the reply! :)

    Hmm yes I completely understand that it would be saving each 'state' to allow undos.. but I just can't believe the sheer amount of memory that a single action needs to allow an undo... we're only talking about a 700kb photo and it's using anywhere between 300mb to over 1GB per action... does it really need THAT much!!?

    Hmm and um so I tried your recommendation to watch memory when I undo any action.. err it doesn't reduce memory usage - it's increasing it!

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