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A couple of questions, along with some suggestions:
1. This one is critical: are you making backups to an external device? If so, what software are you using for that?
2. Have you ever done any disk cleanup/maintenance/repairs, from a software perspective? One can actually do a good amount of disk cleanup on their own, and there are some excellent products available (both free and commercial) that help with those tasks.
Here are a couple of free programs that you can download and run:
Onyx - Available from here: https://www.titanium-software.fr/en/onyx.html (Make sure you downloadsthe correct version)
AppCleaner - Available from here: https://freemacsoft.net/appcleaner/
Malwarebytes - Available from here: https://www.malwarebytes.com/mac/ (can detect adware and remove it)
GrandPerspective - Available from here: http://grandperspectiv.sourceforge.net/ (nice, graphical way to find large files)
There is another excellent virus detection program available, called ClamXAV. It is available from here:
https://www.clamxav.com/
One can use it for free for 30 days. It works very well (although does take some time).
3. Did you upgrade to High Sierra "in place", ie, basically just let it overwrite what was on your Mac already? And before you upgraded, did you insure that all your third party software (ie, non-Apple) was both up to date and compatible with High Sierra?
4. When you checked out your internal drive with Disk Utility, did you do it in an "isolated" manner, ie, by booting to the (hidden) Recovery partition and running Disk Utility from there?
5. From your post, this should be the Mac model you have:
https://everymac.com/systems/apple/...-graphics-late-2013-retina-display-specs.html
(There are at least 4 models for your Mac: https://everymac.com/ultimate-mac-lookup/?search_keywords=MacBookPro11,3)
If that is valid, then you have a 512 gig SSD inside your machine. Please verify all that.
Here is a possible way to proceed:
1. If you do not have a recent backup, do that first. Time Machine is OK, but either SuperDuper! or Carbon Copy Cloner is better. This link I started a while back explains all this:
https://www.mac-help.com/threads/backups-backups-backups.223959/
I myself use SuperDuper!, and it has always been a "life saver" for me. It is especially helpful when I am doing an "upgrade" to a new Mac OS (or sometimes doing an "in Mac OS" upgrade).
2. Boot your Mac to the (hidden) Recovery HD partition, and use Disk Utility there to Verify (and if needed, Repair) your internal SSD. This link explains how to do that:
https://support.apple.com/en-us/HT201314
3. For #2 above, do as much disk cleaning/maintenance as possible, using Onyx, GrandPerspective, and AppCleaner. Also, check your Mac for "adware/malware" by downloading and running Malwarebytes. If you decide to download and run ClamXAV, be aware that letting it scan your entire machine takes time. You should also consider getting a more robust disk cleaning/maintenance/repair program like Tech Tool Pro or Disk Warrior. Be aware, though, that Disk Warrior is not yet compatible with the APFS file system inherent with High Sierra. I use the latest version of Tech Tool Pro (along with Onyx), and I would not be without either of them.
4. One thing that has been up for some "debate" is Repairing Permissions. Apple's Disk Utility used to include that feature, but it was dropped when Sierra came out. Onyx and Tech Tool Pro both used to include that feature also, but it was dropped with the recent upgrades each of them released for High Sierra compatibility. I would recommend you do it, especially if you have never done it, and have upgraded through various versions of the Mac OS. This link explains how to do it:
https://support.apple.com/en-us/HT203538
Try all that (yes, it's a lot of work!), and see if things improve. If not, then the next step would be to 1) do a final backup, 2) Erase and Format the Mac partition, 3) do a fresh, clean installation of OS 10.13.2, and 4) "migrate"/copy needed "stuff" from the backup. For the OS 10.13.2 installation, the link I provided above about backups explains the two "methods" for doing that, depending on what software you use for backups.
1. This one is critical: are you making backups to an external device? If so, what software are you using for that?
2. Have you ever done any disk cleanup/maintenance/repairs, from a software perspective? One can actually do a good amount of disk cleanup on their own, and there are some excellent products available (both free and commercial) that help with those tasks.
Here are a couple of free programs that you can download and run:
Onyx - Available from here: https://www.titanium-software.fr/en/onyx.html (Make sure you downloadsthe correct version)
AppCleaner - Available from here: https://freemacsoft.net/appcleaner/
Malwarebytes - Available from here: https://www.malwarebytes.com/mac/ (can detect adware and remove it)
GrandPerspective - Available from here: http://grandperspectiv.sourceforge.net/ (nice, graphical way to find large files)
There is another excellent virus detection program available, called ClamXAV. It is available from here:
https://www.clamxav.com/
One can use it for free for 30 days. It works very well (although does take some time).
3. Did you upgrade to High Sierra "in place", ie, basically just let it overwrite what was on your Mac already? And before you upgraded, did you insure that all your third party software (ie, non-Apple) was both up to date and compatible with High Sierra?
4. When you checked out your internal drive with Disk Utility, did you do it in an "isolated" manner, ie, by booting to the (hidden) Recovery partition and running Disk Utility from there?
5. From your post, this should be the Mac model you have:
https://everymac.com/systems/apple/...-graphics-late-2013-retina-display-specs.html
(There are at least 4 models for your Mac: https://everymac.com/ultimate-mac-lookup/?search_keywords=MacBookPro11,3)
If that is valid, then you have a 512 gig SSD inside your machine. Please verify all that.
Here is a possible way to proceed:
1. If you do not have a recent backup, do that first. Time Machine is OK, but either SuperDuper! or Carbon Copy Cloner is better. This link I started a while back explains all this:
https://www.mac-help.com/threads/backups-backups-backups.223959/
I myself use SuperDuper!, and it has always been a "life saver" for me. It is especially helpful when I am doing an "upgrade" to a new Mac OS (or sometimes doing an "in Mac OS" upgrade).
2. Boot your Mac to the (hidden) Recovery HD partition, and use Disk Utility there to Verify (and if needed, Repair) your internal SSD. This link explains how to do that:
https://support.apple.com/en-us/HT201314
3. For #2 above, do as much disk cleaning/maintenance as possible, using Onyx, GrandPerspective, and AppCleaner. Also, check your Mac for "adware/malware" by downloading and running Malwarebytes. If you decide to download and run ClamXAV, be aware that letting it scan your entire machine takes time. You should also consider getting a more robust disk cleaning/maintenance/repair program like Tech Tool Pro or Disk Warrior. Be aware, though, that Disk Warrior is not yet compatible with the APFS file system inherent with High Sierra. I use the latest version of Tech Tool Pro (along with Onyx), and I would not be without either of them.
4. One thing that has been up for some "debate" is Repairing Permissions. Apple's Disk Utility used to include that feature, but it was dropped when Sierra came out. Onyx and Tech Tool Pro both used to include that feature also, but it was dropped with the recent upgrades each of them released for High Sierra compatibility. I would recommend you do it, especially if you have never done it, and have upgraded through various versions of the Mac OS. This link explains how to do it:
https://support.apple.com/en-us/HT203538
Try all that (yes, it's a lot of work!), and see if things improve. If not, then the next step would be to 1) do a final backup, 2) Erase and Format the Mac partition, 3) do a fresh, clean installation of OS 10.13.2, and 4) "migrate"/copy needed "stuff" from the backup. For the OS 10.13.2 installation, the link I provided above about backups explains the two "methods" for doing that, depending on what software you use for backups.