10.10.4 Yosemite clean install ssd is slow!Why?

Discussion in 'OS X Yosemite (10.10)' started by AGANG, Aug 13, 2015.

  1. AGANG macrumors member

    Joined:
    Aug 13, 2015
    #1
    I have a 2015 Macbook Pro Retina 13" with 512gb ssd. When I bought my laptop I did a Blackmagic speedtest on the pre installed 10.10.2 Yosemite, and It said the ssd read and write about 1300 mb/s. Then I did a clean/factory reset (Recovery>Disk Utility>Macintosh HD erase)then Reinstall Os X. When my macbook booted up in to the 10.10.4 Yosemite I run again the Blackmagic speedtest and I saw, that the ssd is slower on the oem ssd!!( write: 600mb/s read:1300mb/s). Why? What can I do to fix my ssd write speed?

    Please help me!!(Sorry for my english grammar:))
     
  2. keysofanxiety macrumors 604

    keysofanxiety

    Joined:
    Nov 23, 2011
    #2
    Change testing chunk size in Blackmagic to 5GB & rerun.
     
  3. AGANG thread starter macrumors member

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    Aug 13, 2015
  4. AGANG thread starter macrumors member

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    Aug 13, 2015
  5. Weaselboy Moderator

    Weaselboy

    Staff Member

    Joined:
    Jan 23, 2005
    Location:
    California
    #5
    Do a command-r boot to recovery and from there launch Disk Utility and to a "repair disk" on the drive. Toward the end you will see a message that unused space has been trimmed. What that does is run the TRIM command on unused blocks on the drive and can help write speeds. When that is done, quit Disk Utility and restart.
     
  6. AGANG thread starter macrumors member

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    Aug 13, 2015
    #6
    Thank you for your support, I appriciate it.
    Should I run only Disc Utility from Recovery or can I run from the booted up Yosemite too (does it matter?)
     
  7. Weaselboy Moderator

    Weaselboy

    Staff Member

    Joined:
    Jan 23, 2005
    Location:
    California
    #7
    To TRIM unused blocks, it needs to be done from recovery.
     
  8. AGANG thread starter macrumors member

    Joined:
    Aug 13, 2015
    #8
    Thank you your help! It's work very well after repair disk. :)
     

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