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iMac Unusably slow after High Sierra Upgrade

I have a 2014 27" i7 Retina iMac. It has slowed to the point of being unusable after upgrading to High Sierra. Simply opening Finder takes more than 5 minutes before the files are done displaying and the beachball stops.

 

Is there anything that I can try before I restore from a backup?

Possible Fixes for High Sierra

You should try each, one at a time, then test to see if the problem is fixed before going on to the next.

 

    Be sure to backup your files before proceeding if possible.

 

  1. Shutdown the computer, wait 30 seconds, restart the computer.
  2. Resetting your Mac’s PRAM and NVRAM
  3. Reset the System Management Controller (SMC)
  4. Start the computer in Safe Mode, then restart normally. This is slower than a standard startup.
  5. Repair the disk by booting from the Recovery HD. Immediately after the chime hold down the Command and R keys until the Utility Menu appears. Choose Disk Utility and click on the Continue button. Select the indented (usually, Macintosh HD) volume entry from the side list.  Click on the First Aid button in the toolbar. Wait for the Done button to appear. Quit Disk Utility and return to the Utility Menu. Restart the computer from the Apple Menu.
  6. Create a New User Account Open Users & Groups preferences. Click on the lock icon and enter your Admin password when prompted. On the left under Current User click on the Add [+] button below Login Options. Setup a new Admin user account. Upon completion log out of your current account then log into the new account. If your problems cease, then consider switching to the new account and transferring your files to it - Transferring files from one User Account to another.
  7. Download and Install 10.13.1 High Sierra Update
  8. Reinstall OS X by booting from the Recovery HD using the Command and R keys. When the Utility Menu appears select Reinstall OS X then click on the Continue button.
  9. Erase and Install OS X Restart the computer. Immediately after the chime hold down the Command and R keys until the Apple logo appears. When the Utility Menu appears:
  1. Select Disk Utility from the Utility Menu and click on Continue button.
  2. When Disk Utility loads select the drive (out-dented entry) from the Device list.
  3. Click on the Erase icon in Disk Utility's toolbar. A panel will drop down.
  4. Set the Format type to Mac OS Extended (Journaled.)
  5. Click on the Apply button, then wait for the Done button to activate and click on it.
  6. Quit Disk Utility and return to the Utility Menu.
  7. Select Install OS X and click on the Continue button.

Ways to help make a slow Mac faster

 

  1. 17 Reasons Why Your Mac Runs Slower Than it Should
  2. Slow Mac Performance? This Article Solves It!
  3. Fix slow start-ups in OS X | MacFixIt - CNET Reviews
  4. How to fix slow shutdown and startup times. | MacTip.net
  5. 6 Easy Tips to Speed Up OS X Yosemite on Your Mac
  6. OS X El Capitan- If your Mac runs slowly
  7. Visit The XLab FAQs and read the FAQ on Performance
  8. Tips to Fix Issues that affect Mac Performance
  9. Avoid using any third-party cleanup software. Usually, this software does more bad than good. You don't need it. All computers become slower over time even under normal use. Experienced users erase the hard drive and do a clean install from scratch from time to time; or whenever installing a major OS upgrade. Doing so means you must maintain regular and multiple backups.
  10. If you have enabled iCloud Disk and are storing your Documents and Data in iCloud, then consider turning that off and signing out of iCloud. It can slow down the computer considerably. Please see the following from the user, fotomac: "The solution was to SIGN OUT of iCloud and my problem STOPPED! NO MORE SPINNING BEACHBALL! My computer's speed increased to what it should be and all my Apps now work!"
  11. Add more RAM or cut back on the number of concurrently running applications and utilities. Remove unnecessary anti-malware software and any software that promises to clean your Mac. Check for runaway processes: Runaway applications can shorten battery runtime, affect performance, and increase heat and fan activity. Also, visit The XLab FAQs and read the FAQ on dealing with The Spinning Beach Ball of Death.
  12. The Ultimate Fix: Backup everything, erase the drive, reinstall OS X, and restore your data from the backup. Reinstall third-party software from original media/scratch.

I noticed that iMac slowed down considerably after High Sierra upgrade. I thought something was wrong with my system, but I see other users are having same problems.

DanielDay wrote:

 

I noticed that iMac slowed down considerably after High Sierra upgrade. I thought something was wrong with my system, but I see other users are having same problems.

Yes, and perhaps thats true however the VAST majority of users have no problems at all.

I tried resetting SMC and PRAM. No improvement.

I tried letting it sit for a day; I figured perhaps the system needs to sort out which files go to which physical drive. No Improvement.

I tried to repair the disk from Disk utility. no improvement

I tried to restore a backup of Sierra. It started out fine but then slowed to a crawl, stating that it will take 388. I stopped it.

 

I then erased the fusion drive (HSF) and reinstalled the Yosemite from Internet Recovery. I then upgraded to High Sierra from the App Store.

 

I planned to copy my files (1.5TB)from the backup to the new OS. I had started it up and came back to check the progress. As before, the process had slowed to a crawl (28 days to finish copying??). The entire system has again slowed; opening the activity monitor takes 5 minutes.

 

I suspect that one or both of my physical disks are bad. Is there any way I can diagnose this further?

 

Edit: In theactivity monitor, processor usage is near zero, and disk read/write is mostly zero with an occasional split-second blip at 5 mb/s. This is with the system working at copying my data back to the computer. The connection is over 1gb LAN and the NAS is fast when accessed from other systems. Also, a disk speed check on the system says zero mb/s.

最后更新：2017-11-13 16:17:49

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