My MBP's SSD slowed down.

Discussion in 'MacBook Pro' started by Ibanezq, Feb 19, 2018.

  1. Ibanezq, Feb 19, 2018
    Last edited: Feb 19, 2018

    Ibanezq macrumors newbie

    Ibanezq

    Joined:
    Feb 28, 2017
    Location:
    Warsaw/Poland
    #1
    I've a MacBook Pro 15" Mid 2015 with 1TB SSD and I noticed that write speed changed from ~ 1200MB/s to ~500MB/s after 1 year of using. Read speed is ~1800MB/s and still the same value after this time.

    New disk: http://jmp.sh/xnoOMgK

    Now: http://jmp.sh/cZmUuYZ

    Drive has ~ 35TB of total bytes written, wear leveling count is 97% (data from DriveDx software):

    http://jmp.sh/NJ5OqP7



    How to check what's reason of this ssd slowdown?
     
  2. Patcell macrumors 6502

    Joined:
    Aug 8, 2016
    Location:
    Bergen County, NJ
    #2
    How full is the drive? It will slow down with more data stored.
     
  3. Ibanezq thread starter macrumors newbie

    Ibanezq

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  4. Patcell macrumors 6502

    Joined:
    Aug 8, 2016
    Location:
    Bergen County, NJ
    #4
    Wow... I don’t think 50% usage should slow it down that much. I have a 512GB drive about half full and I get pretty close to original speed. Mine is a 2017 15” Pro.
     
  5. Ibanezq thread starter macrumors newbie

    Ibanezq

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    #5
    Maybe this is not the reason and is the other problem with system/drive?
     
  6. keysofanxiety macrumors G3

    keysofanxiety

    Joined:
    Nov 23, 2011
    #6
    Are you on the latest version of High Sierra? I've seen some reports advising that in some instances write speed has been reduced on APFS, though I'm not personally experiencing this issue.
     
  7. Ibanezq thread starter macrumors newbie

    Ibanezq

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  8. Weaselboy Moderator

    Weaselboy

    Staff Member

    Joined:
    Jan 23, 2005
    Location:
    California
    #8
    Do a command-r boot to recovery then start Disk Utility and run first aid on the disk. Toward the end of the text readout there you should see a message something like "trimming unused blocks"... (I cannot recall exactly what it says). When that is done reboot and test again.

    What that does is TRIM free space on the drive and often that will restore write speeds.
     
  9. Ibanezq thread starter macrumors newbie

    Ibanezq

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    Feb 28, 2017
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    Warsaw/Poland
    #9
    Solved - thank you. :)
    Could you explain why first aid is nessesary although High Sierra supports TRIM?
     
  10. Weaselboy Moderator

    Weaselboy

    Staff Member

    Joined:
    Jan 23, 2005
    Location:
    California
    #10
    That first aid is using a TRIM command also, but run from recovery like that it seems to clean up the unused space and speed things up. I agree with what I think you are saying... that this should not be necessary... but it seems to be sometimes. Did you happen to do anything that results in a lot of heavy write activity lately?
     
  11. Ibanezq thread starter macrumors newbie

    Ibanezq

    Joined:
    Feb 28, 2017
    Location:
    Warsaw/Poland
    #11
    No, I write a few 3-5GB files every day only.
     

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10 February 19, 2018