SSD not so fast as the first time ...

Discussion in 'MacBook Pro' started by AGANG, Mar 23, 2016.

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  1. AGANG macrumors member

    Joined:
    Aug 13, 2015
    #1
    HI!

    When I bought my 2015 13" Retina Macbook Pro with 512GB SSD (with Yosemite), I ran a Black Magic Speed test and It showed me about 1300 MB/s write and read speed. Nowadays I ran a Black Magic again after 4 months later (with ElCapitan) and It showed me only 600 MB/s write speed (half as the first time!!!) and 1200 MB/s read speed.
    At the first time I had 500 GB free space now I had only 20 GB.

    My Question is: How can I get again 1300 MB/s write speed?

    Under you can see the pictures of Black Magic results.

    Thank you :)
     

    Attached Files:

  2. CoastalOR macrumors 68020

    CoastalOR

    Joined:
    Jan 19, 2015
    Location:
    Oregon, USA
    #2
    I think a big part of the problem is how full your SSD is. You have less than 4% free space on the SSD. I've read people recommend 15% to 20% free (unfortunately I do not have specific official reference links). You could do a search recommended SSD free space.
     
  3. navaira macrumors 68040

    navaira

    Joined:
    May 28, 2015
    Location:
    Amsterdam, Netherlands
    #3
    I was looking around for a similar thread and found this – just tested my rMBP and found that, indeed, same as original poster's problem, write speed dropped to 617 MB/s. Read is at 1414 MB/s. Filevault is disabled and system reinstalled 2 days ago (I tried Sierra, discovered Karabiner doesn't work, restored from Time Machine). It's a 128 GB model with 33 GB free. I scanned it with Disk Utility which fixed something in headers – before the scan it was even slower at 480/1100 MB.

    Any hints?
     
  4. robvas macrumors 68030

    Joined:
    Mar 29, 2009
    Location:
    USA
    #4
    Was the 128GB model ever faster than that for write speeds?
     
  5. navaira macrumors 68040

    navaira

    Joined:
    May 28, 2015
    Location:
    Amsterdam, Netherlands
    #5
    Yup, at the beginning I had similar speeds as the OP. I don't have a screenshot but I was all excited about the speeds as I've never seen anything like that before. :)
     
  6. leman macrumors G3

    Joined:
    Oct 14, 2008
    #6
    SSDs are known to slow down as they fill up. But in any case, its very unlikely that the reduced speed will have any impact on your normal laptop use.
     
  7. navaira macrumors 68040

    navaira

    Joined:
    May 28, 2015
    Location:
    Amsterdam, Netherlands
    #7
    Yes, of course. I was just surprised to see the speed drop to 50% – I've wondered if perhaps it would help if I did a clean reinstall of El Capitan, then restored from TM rather than just straight restore?

    Did some cleanup in the meantime, now waiting for Spotlight to reindex.
     

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