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Hi guys, I have MBP 2011 and after fresh installation macOS (High Sierra - boot from USB High Sierra install drive, erase SSD and made new installation of macOS ). It’s look like it’s slower than before (even the installation took longer than usual). But if I run Apple diagnostics it’s everything OK. Any ideas ? Thanks a lot :)
You likely need a new HD cable! Sadly the original cables only supported the slower SATA II (3.0Gb/s) HDD Apple used originally. They later upgraded the cable a few times! The last version is able to support SATA III (6.0 Gbps) HDD’s or SSD’s. So I would start there MacBook Pro 13" Unibody (Early 2011-Late 2011) Hard Drive Cable and here’s the guide MacBook Pro 13" Unibody Early 2011 Hard Drive Cable Replacement Here’s a bit more on the cable issue Your Hard Drive Cable Is A Ticking Time Bomb I only use one strip as that’s all thats needed to hold the cable off the rough uppercase. Even still there is still one more issue! Often I find people kill the new cable by damaging it! You can’t crease the cable as that damages the thin foil wires within it. I use an old BIC pen ink straw (empty) to help me form a curl in the cable I don’t want the radius of the cabal to exceed the diameter of the straw when the cable needs to bend around. And don’t fold the cable at the connector either. Lastly, I would recommend after you make the repairs, make a full backup, then format the drive and re-install the OS. If you haven’t I would also start off making a bootable OS installer thumb drive (32GB) following this guide to speed things up How to create a bootable installer for macOS then restore your stuff as its likely you have a few corrupt files.
