17" Running on Battery (big performance decrease)

Discussion in 'MacBook Pro' started by geltab, Mar 30, 2009.

  1. geltab macrumors member

    Apr 18, 2007
    I have the most recent 17" Matte Unibody with a 2.93 ghz, 4gb ram, 7200 320gb hard drive.

    I noticed something very annoying last night on the plane. I was running an action in Illustrator to save pdf files at the lowest resolution and quality. I normally do this by running the batch mode, but I noticed it was taking 20 seconds per file. It is usually instantly that it can perform this action. Every once in a while it would perform the action at the normal instant speed, but 95 % of the pages were taking about 20 seconds. I then followed stopped the batch and tried manually doing single page saves from my action and got the same results.

    So I decided to log out and log back in under "better performance". I unchecked all of the options to save battery life and didn't have the screen saver or screen dimmer set. I even restarted the computer. Still the same slow results. I get home, all of the above actions listed with my computer plugged in and I was back to full speed.

    Am I missing some kind of performance option in the energy saver options?
    I remember on Tiger that you could pick "better battery life" and "better performance." Is that not in Leopard.

    Does any one have any idea what could be causing this sluggish performance? I also did a repair disk permissions, ran the verify disk, set the hard drive to never go to sleep, check the activity monitor and didn't notice anything big going on behind the scenes. I just had Illustrator CS4 open. I also reset the Pram.

  2. iLog.Genius macrumors 601


    Feb 24, 2009
    Toronto, Ontario
    Had a similar thread. Supposedly when you're running off the battery, the CPU/other hardware is throttled to save battery. Again, no evidence, but some users have chimed in with that theory.
  3. Pagga macrumors 6502


    Feb 21, 2009
    Closer to the Artic circle than I like to be
    I suspect the same thing with my 17" unibody. Also, I notice the heat building alot faster when plugged in.

  4. geltab thread starter macrumors member

    Apr 18, 2007
    I read that other thread... but this is a very noticeable difference. We are talking about 20 seconds vs. less than 1 second when plugged in to perform a simple task.

    I just wonder if it is more prominent in specific tasks or if it is an Adobe CS4 thing. I have been have lots of performance issues while plugged in with CS4 Photoshop. The only odd thing here is that the same task that I do in Illustrator plugged in and not plugged are like night and day as far as speed is concerned and every once in a while (about every 1 in 40 pages) the action would work at the plugged in speed.
  5. eldy macrumors 6502

    Jan 30, 2009
    The City
  6. miles01110 macrumors Core


    Jul 24, 2006
    The Ivory Tower (I'm not coming down)
    I thought that most (all?) Apple notebooks throttled down when on battery only...
  7. ayeying macrumors 601


    Dec 5, 2007
    Yay Area, CA
    Mine doesn't throttle down on battery. Verified with playing CoD4 in Battery and AC mode on 9600GT.

    If you have a seagate hard drive, i'd see if its the hard drive. My seagate hard drive gives me major issues such as stalls for no reason, random crashes, etc.

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