Yosemite extremely slow

Discussion in 'OS X Yosemite (10.10)' started by InternetDude08, Jul 27, 2014.

  1. InternetDude08 macrumors regular

    Dec 16, 2009
    Desktop is late 2012 iMac 21.5, 3.1 GHz i7, 16 GB RAM, FusionDrive. Fast machine, runs Mavericks speedy fast.

    I installed the public beta onto a formatted bootable Lexar 64 GB USB3 drive. It installed just fine and runs, but it's extremely slow. It is slow to load apps (takes minutes not seconds). Once loaded the apps are OK (such as browsing in safari, etc.) but loading them initially is super slow.

    I made sure the spotlight indexer is not running. And I also did the "Repair Disk permissions" on the drive, which actually helped a tiny bit.

    Do you guys have any other tips or ideas for me to try to get this running fast? I did a fresh install, I did not import anything from my main mac account, I haven't even enabled iCloud or iMessaging or anything like that yet.

    I already submitted Feedback to Apple regarding the issue.
  2. chabig macrumors 601

    Sep 6, 2002
    You're booting from a flash drive. Those things are slow--probably 50-100 times slower than an SSD, and 25-50 times slower than a hard drive. Apple can't help you with that.
  3. InternetDude08 thread starter macrumors regular

    Dec 16, 2009
    I know a guy with an older Mac running off a USB drive that is not USB3 and his is running fast, no problems.
  4. chabig macrumors 601

    Sep 6, 2002
    It's not the USB interface that's slow. It's the storage device. A "USB drive" and a "USB flash drive" are not the same thing. Get yourself a small external hard drive and you'll be fine.
  5. MartinAppleGuy macrumors 68020


    Sep 27, 2013
    If its an older Mac, then it's an older OS, and if its an older OS it has less data to request for allowing it to handle it ok. Just think of it as him running Windows 95 on a current machine. You are trying to do the impossible though.

    A standard USB reads at around 50-60 MBps and writes at about 3-5MBps. Unless you have one of those extremely expensive USB's that supossidly offer 200+ read/write, running a current OS is going to be painfully slow.

    Install it on an external HDD (you could get a 500GB for the same price as a 64GB USB).
  6. johnnnw macrumors 65816


    Feb 7, 2013
    Not sure why you submitted it to Apple when it's your slow USB drive

    USB is not inherently slow, but your drive must be.

    Use a speed test program and test it, then you'll see the problem.
  7. InternetDude08 thread starter macrumors regular

    Dec 16, 2009
    I don't know if it's related but the Spotlightnethelper process never actually runs right, it's always in the Not Responding state. Always.

    Hmmm... turns out my USB thumb drive is slower than I realized: 64GB in green (up to 45MB/s read, 20MB/s write)


    When I bought it I thought it was fast, I guess not fast enough to run an OS.

    I don't really want to buy an external drive, I was hoping to run it off a USB thumb drive that I could re-use later, I have enough cables and crap I don't want another drive.

    I think this will work though: http://www.lexar.com/products/lexar-jumpdrive-p10-usb3-flash-drive?category=207
  8. chabig macrumors 601

    Sep 6, 2002
    That newer one you linked to will probably work much better, but it's expensive. Keep in mind that these aren't designed to be used the way you intend--they are for portable data storage. They don't last as long as a hard drive or SSD. Continuous use will wear it out.
  9. InternetDude08 thread starter macrumors regular

    Dec 16, 2009
  10. Fenderf4i macrumors member

    Aug 19, 2013
    Does your Mac have Thunderbolt? If so, get a Thunderbolt drive and use it for something else later.
  11. InternetDude08 thread starter macrumors regular

    Dec 16, 2009
    Yep. I hate external drives so I'll have to think about it. Obviously the USB stick isn't up to the task.
  12. applCore macrumors regular


    May 3, 2011
    Interesting, I am running this on an SSD and getting quite slow speeds after 30 minutes to 2 hours. Reported to Apple, but no word back yet. Further, Safari is unworldly slow after running for a bit.

    Unfortunately I've not been able to track down a / the culprit(s) yet regarding OS X itself or Safari.
  13. InternetDude08 thread starter macrumors regular

    Dec 16, 2009
    Update: Well I bought this and installed Yosemite and it's running just fine now: http://www.amazon.com/gp/product/B00CG5EF8K/

    Problem solved :apple:

    Up to 265 MB/s read, 245 MB/s write. Not as fast as SSD but I don't care, it's fast enough for me, plus it's more useful for me after the beta is done.

    If someone thinks you can't run an OS off a bootable USB stick, send 'em a link to this thread.
  14. Ronnoco macrumors 68030


    Oct 16, 2007
    United States of America
    I run DP5 on a 64gb USB 3.0 SanDisk Extreme stick and it runs flawlessly.

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