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Question: High Sierra upgrade slowed system, how to downgrade to Sierra 10.12.5

Last week a new update for Sierra was automatically installed on my computer, which really messed up my system, a 2013 Macbook pro, upgraded with SSD hard drive and 16GB ram. Everything was freezing and slowed down considerably, trouble staying connected to wifi. I felt like this was done to force users to upgrade to High Sierra which I did, but system is still much slower and lags terribly, much worse than last week when I was using 10.12.5. How can I go back to the previous version of Sierra?

MacBook Pro, macOS High Sierra (10.13.1)

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Nov 17, 2017 7:18 AM in response to dialabrain In response to dialabrain

Hi dialabrain, here you are:

0) Make a backup of your Mac - use Time Machine

1) Make a second backup of your Mac - use Carbon Copy Cloner

2) Ensure your backups are working properly, i.e. by accessing files in the drive

3) Once you have downloaded Sierra, you will need to create a bootable USB installer on your Mac:

4) Once the installer is created, boot off it using Startup Disk in System Preferences

5) Erase your disk in Disk Utility on the installer, then reinstall Sierra

6) once reinstalled, ATTEMPT to migrate data (or at least applications) from your Carbon Copy backup

7) if this fails due to the newer OS of the backup, you will need to create a new account on the Mac and manually reinstall apps and migrate data.

These instructions will revert your OS to 10.12.6.

Nov 17, 2017 7:18 AM

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Nov 17, 2017 7:22 AM in response to minacrime In response to minacrime

minacrime wrote:

One assumes that they would be happy going back to any iteration of 10.12.x. My instructions allow for that.

One doesn't have to assume. The user specifically asked for 10.12.5 in bold. He also stated he had just updated Sierra which started his "problem".

Nov 17, 2017 7:22 AM

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Nov 18, 2017 5:35 AM in response to dialabrain In response to dialabrain

EtreCheck version: 3.4.6 (460)

Report generated 2017-11-18 14:30:58

Download EtreCheck from

Runtime: 3:17

Performance: Good

Click the [Lookup] links for more information from Apple Support Communities.

Click the [Details] links for more information about that line.

Problem: Computer is too slow

Hardware Information:

MacBook Pro (13-inch, Mid 2012)

[Technical Specifications] - [User Guide] - [Warranty & Service]

MacBook Pro - model: MacBookPro9,2

1 2,5 GHz Intel Core i5 (i5-3210M) CPU: 2-core

16 GB RAM Upgradeable - [Instructions]


8 GB DDR3 1600 MHz ok


8 GB DDR3 1600 MHz ok

Handoff/Airdrop2: supported

en1: 802.11 a/b/g/n

Battery: Health = Normal - Cycle count = 219

iCloud Quota: 2.70 GB available

Video Information:

Intel HD Graphics 4000 - VRAM: 1536 MB

Color LCD 1280 x 800

Disk Information:

Samsung SSD 750 EVO 500GB disk0: (500,11 GB) (Solid State - TRIM: No)

[Show SMART report]

EFI (disk0s1 - MS-DOS FAT32) <not mounted>
[EFI]: 210 MB

(disk0s2) <not mounted>
[APFS Container]: 499.90 GB


USB Information:



Apple Inc. FaceTime HD Camera (Built-in)




Apple Inc. Apple Internal Keyboard / Trackpad

Apple Computer, Inc. IR Receiver

Apple Inc. BRCM20702 Hub

Apple Inc. Bluetooth USB Host Controller


Thunderbolt Information:

Apple Inc. thunderbolt_bus

Virtual disks:

Macintosh HD (disk1s1 - APFS) /
[Startup]: 499.90 GB (253.40 GB free)

Physical disk: disk0s2 499.90 GB (253.40 GB free)

(disk1s2) <not mounted>
[Preboot]: 499.90 GB

Physical disk: disk0s2 499.90 GB

(disk1s3) <not mounted>
[Recovery]: 499.90 GB

Physical disk: disk0s2 499.90 GB

(disk1s4) /private/var/vm
[VM]: 499.90 GB

Physical disk: disk0s2 499.90 GB

System Software:

macOS High Sierra
10.13.1 (17B48) - Time since boot: less than an hour


Mac App Store and identified developers

Kernel Extensions:

/Library/Application Support/Avast/components/fileshield/signed

[loaded] com.avast.FileShield (3.0.0 - SDK 10.9) [Lookup]

/Library/Application Support/Avast/components/proxy/signed

[loaded] com.avast.PacketForwarder (2.1 - SDK 10.11) [Lookup]


[loaded] com.AmbrosiaSW.AudioSupport (4.1.4 - SDK 10.11) [Lookup]


[not loaded] com.usb2serdevice.driver.USBCDCACM (215.06.0 - SDK 10.9) [Lookup]

[loaded] com.valvesoftware.SteamInput (3083.39.61 - SDK 10.8) [Lookup]

[not loaded] org.dungeon.driver.SATSMARTDriver (0.8.1 - SDK 10.6) [Lookup]

System Launch Agents:

[not loaded] 8 Apple tasks

[loaded] 183 Apple tasks

[running] 97 Apple tasks

System Launch Daemons:

[not loaded] 36 Apple tasks

[loaded] 188 Apple tasks

[running] 106 Apple tasks

Launch Agents:

[not loaded] com.adobe.AAM.Updater-1.0.plist (Adobe Systems, Inc. - installed 2017-10-24) [Lookup]

[failed] com.adobe.ARMDCHelper.cc24aef4a1b90ed56a725c38014c95072f92651fb65e1bf9c8e43c37a2 3d420d.plist (Adobe Systems, Inc. - installed 2017-01-12) [Lookup]

[running] com.adobe.AdobeCreativeCloud.plist (Adobe Systems, Inc. - installed 2017-09-26) [Lookup]

[running] com.avast.osx.secureline.update-agent.plist (AVAST Software a.s. - installed 2017-10-24) [Lookup]

[loaded] com.avast.osx.secureline.userinit.plist (Shell Script 2fc1004f - installed 2017-10-24) [Lookup]

[running] com.avast.update-agent.plist (AVAST Software a.s. - installed 2017-09-22) [Lookup]

[loaded] com.avast.userinit.plist (Shell Script bb25154c - installed 2017-09-22) [Lookup]

[loaded] (Seiko Epson Corporation - installed 2017-10-21) [Lookup]

[not loaded] com.teamviewer.teamviewer.plist (TeamViewer GmbH - installed 2016-10-02) [Lookup]

[not loaded] com.teamviewer.teamviewer_desktop.plist (TeamViewer GmbH - installed 2016-10-02) [Lookup]

[running] (Canon Inc. - installed 2016-12-24) [Lookup]

Launch Daemons:

[loaded] com.adobe.ARMDC.Communicator.plist (Adobe Systems, Inc. - installed 2017-01-12) [Lookup]

[loaded] com.adobe.ARMDC.SMJobBlessHelper.plist (Adobe Systems, Inc. - installed 2017-01-12) [Lookup]

[loaded] com.adobe.acc.installer.plist (Adobe Systems, Inc. - installed 2017-09-26) [Lookup]

[running] com.adobe.agsservice.plist (Adobe Systems, Inc. - installed 2017-09-28) [Lookup]

[loaded] com.ambrosiasw.ambrosiaaudiosupporthelper.daemon.plist (Ambrosia Software, Inc. - installed 2015-09-11) [Lookup]

[not loaded] (? 1963bf56 0 - installed 2017-11-11)

[loaded] com.avast.init.plist (Shell Script fc55b6fa - installed 2017-09-22) [Lookup]

[loaded] com.avast.osx.secureline.init.plist (Shell Script 1bda83b1 - installed 2017-10-24) [Lookup]

[loaded] com.avast.osx.secureline.uninstall.plist (Shell Script ba7a0061 - installed 2017-10-24) [Lookup]

[loaded] com.avast.osx.secureline.update.plist (Shell Script f50a649c - installed 2017-10-24) [Lookup]

[loaded] com.avast.uninstall.plist (Shell Script 22f94791 - installed 2017-09-22) [Lookup]

[loaded] com.avast.update.plist (Shell Script d6c32197 - installed 2017-09-22) [Lookup]

[loaded] com.teamviewer.Helper.plist (TeamViewer GmbH - installed 2016-09-19) [Lookup]

[not loaded] com.teamviewer.teamviewer_service.plist (TeamViewer GmbH - installed 2016-10-02) [Lookup]

User Launch Agents:

[running] ALDI TALK.plist (? 1c6dd779 c51e41e7 - installed 2016-10-21) [Lookup]

[loaded] com.adobe.AAM.Updater-1.0.plist (Adobe Systems, Inc. - installed 2017-10-19) [Lookup]

[loaded] com.avast.home.userinit.plist (Shell Script 2f8b4238 - installed 2017-09-22) [Lookup]

[loaded] com.avast.osx.secureline.home.userinit.plist (Shell Script 83092ee6 - installed 2017-10-24) [Lookup]

[loaded] com.dropbox.DropboxMacUpdate.agent.plist (Dropbox, Inc. - installed 2017-08-11) [Lookup]

[loaded] (Google, Inc. - installed 2017-09-28) [Lookup]

[loaded] (Skype Communications S.a.r.l - installed 2017-11-13) [Lookup]

[loaded] com.valvesoftware.steamclean.plist (? f8750d09 da197cc4 - installed 2017-10-11) [Lookup]

User Login Items:

Dropbox Application


MEGAsync Application


(null) SMLoginItem - Hidden (? 0 - installed 2017-01-17)

(~/Library/Containers/com.avast.passwords.Passwords/Data/Library/Application Support/Avast Passwords/Avast Passwords 1.1.2129.53-m/Avast

(null) SMLoginItem - Hidden (AVAST Software a.s. - installed 2016-12-14)


Internet Plug-ins:

AdobePDFViewerNPAPI: 17.012.20098 (installed 2017-11-14) [Lookup]

QuickTime Plugin: 7.7.3 (installed 2017-10-25)

AdobePDFViewer: 18.009.20044 (installed 2017-11-14) [Lookup]

Unity Web Player: UnityPlayer version 5.3.6f1 (installed 2016-08-07) [Lookup]

AdobeAAMDetect: (installed 2017-09-26) [Lookup]

EPPEX Plugin: 10.0 (installed 2016-05-23) [Lookup]

Safari Extensions:

[enabled] Adblock Plus - Eyeo GmbH - (installed 2017-11-12)

3rd Party Preference Panes:

MusicManager (installed 2015-11-18) [Lookup]

Time Machine:

Mobile backups: OFF

Auto backup: YES

Volumes being backed up:

Macintosh HD: Disk size: 499.90 GB Disk used: 246.50 GB


JKH_TM [Local]

Total size: 499.76 GB

Total number of backups: 1

Oldest backup: 14.09.17, 00:25

Last backup: 14.09.17, 00:25

Size of backup disk: Too small

Backup size 499.76 GB < (Disk used 246.50 GB X 3)

Top Processes by CPU:






Top Processes by Memory:

912 MB kernel_task

176 MB Dropbox

168 MB mds_stores

163 MB com.avast.daemon

137 MB Adobe CEF Helper

Top Processes by Network Use:

Input Output Process name

68 KB 129 KB Dropbox

19 KB 8 KB gamed

17 KB 6 KB cloudd

12 KB 6 KB mDNSResponder

5 KB 11 KB apsd

Top Processes by Energy Use:

32.64 mds_stores

7.96 WindowServer

2.04 identityservicesd

1.12 com.avast.daemon

Virtual Memory Information:

12.25 GB
Available RAM

6.97 GB
Free RAM

3.75 GB
Used RAM

5.28 GB
Cached files

0 B Swap Used

Software installs (last 30 days):

EPSON Software Updater:
(installed 2017-10-21)

Adobe Acrobat Reader DC (18.009.20044):
(installed 2017-11-14)

Install information may not be complete.

Diagnostics Events (last 3 days for minor events):

2017-11-18 14:27:06 Last shutdown cause: 3 - Hard shutdown

2017-11-16 16:20:57 Hang [Open]

Nov 18, 2017 5:35 AM

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User profile for user: jkharrell

Question: High Sierra upgrade slowed system, how to downgrade to Sierra 10.12.5