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I stumbled on other posts about the Ridiculously Slow Macbook pro 2013 That were remedied by replacing the harddrive cable. I am dealing with agonizing sluggish behaviour on my mac, It seems to be the same issue however as you know 2015 macbook pros have SSD's.. do you think its about replacing my SSD as opposed to a cable swap.

I am desperate for help, I can't use my computer...

can you help me figure out what to do?

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  • Possible duplicate of My Mac is getting really slow, what should I do?
    – Allan
    Commented Jun 13, 2017 at 16:15
  • Is this about a 2013 Mac or a '15? Either way, both have SSDs and both have non-upgradable memory. The only things you can reliably do is 1) run Apple Hardware Test (AHT). Hold the D key while booting from a powered off state with the AC adapter connected. This will let you know if you have a HW problem. 2) Do a fresh, clean install of macOS and migrate data from Time Machine (after doing a back up of course)
    – Allan
    Commented Jun 13, 2017 at 16:18
  • Not quite a duplicate. This is a very different machine. The machine in that question is an old MBP with an optical bay, user-replaceable RAM, and just generally much easier to operate on. If he really means 2013, then it would have to be an rMBP.
    – William T Froggard
    Commented Jun 13, 2017 at 16:24

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I have yet to see a horrible, measurable slow down, but that is exactly what is expected as SSD wear out.

If you have an easy SSD handy to swap, I would get a black magic disk test benchmark before and after the swap.

If you don’t, perhaps get a benchmark of disk IO and then erase the drive after backing up and repeat the test in a fresh os install that is mostly empty of user data.

Once you can post some specific read and write speeds, that would let other people chime in if you're in the same ballpark for speeds.

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