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Coresync causes high Explorer.exe CPU usage

New Here ,
Apr 02, 2019

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I have two machines running Windows 1809 and the latest versions of Adobe CC.

Whether file sync is running or paused, Core Sync causes the Windows Explorer process to use a minimum of 42% CPU.

I'm writing this on a machine with no files left to sync. No files are being synced at this time. Core Sync is running, and Windows Explorer is hitting 43.8% CPU usage.

Killing Core Sync returns usage to normal.

This is not a machine specific issue but occurs on multiple Win 10 1809 devices.

It appears Adobe has a bug to squish.

For reference, this user is having the same trouble: https://www.reddit.com/r/Adobe/comments/9o7a4c/core_sync_causes_windows_10_explorer_more_to_have/

Any thoughts, Adobe?

It would be nice if Adobe actually fixed this, but in the meantime you can limit the amount of CPU the process uses to prevent your machine hanging for 10 minutes at a time. You need to do the following;

  1. Open task manager (windows key + T or just search task manager from the start menu)
  2. If it opens in the reduced view, click on more details;
    file1.png
  3. Click on the Details tab
  4. Find CoreSync.exe in the list
  5. Right click and select Set priority --> Low
    file3.png
  6. Right click again, and select set affinity
  7. Uncheck <All Processors>
  8. Check just one processor

Hope this helps. It at least stopped the process from hanging my machine almost every morning.

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Creative Cloud

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Coresync causes high Explorer.exe CPU usage

New Here ,
Apr 02, 2019

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I have two machines running Windows 1809 and the latest versions of Adobe CC.

Whether file sync is running or paused, Core Sync causes the Windows Explorer process to use a minimum of 42% CPU.

I'm writing this on a machine with no files left to sync. No files are being synced at this time. Core Sync is running, and Windows Explorer is hitting 43.8% CPU usage.

Killing Core Sync returns usage to normal.

This is not a machine specific issue but occurs on multiple Win 10 1809 devices.

It appears Adobe has a bug to squish.

For reference, this user is having the same trouble: https://www.reddit.com/r/Adobe/comments/9o7a4c/core_sync_causes_windows_10_explorer_more_to_have/

Any thoughts, Adobe?

It would be nice if Adobe actually fixed this, but in the meantime you can limit the amount of CPU the process uses to prevent your machine hanging for 10 minutes at a time. You need to do the following;

  1. Open task manager (windows key + T or just search task manager from the start menu)
  2. If it opens in the reduced view, click on more details;
    file1.png
  3. Click on the Details tab
  4. Find CoreSync.exe in the list
  5. Right click and select Set priority --> Low
    file3.png
  6. Right click again, and select set affinity
  7. Uncheck <All Processors>
  8. Check just one processor

Hope this helps. It at least stopped the process from hanging my machine almost every morning.

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Creative Cloud

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1.8K

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New Here ,
Apr 07, 2019

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You're not the only one, I have the same problem both on my desktop and laptop. And I even reset windows to its original state, to no avail (and a loss of a lot of time).

Very disappointed because it is the only cloud service I encountered with this problem, it simply makes the service unusable at times.

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Adobe Community Professional ,
Apr 09, 2019

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Feature Request/Bug Report Form  — to report suspected bugs.

Regards,
Abambo
Hard- and Software Engineer and Photographer

I'm not an Adobe employee. All advice constitutes my own opinion. Use at your risk! 🙂

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New Here ,
Apr 10, 2019

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Already done. Posting HERE, however, confirms my suspicions that I'm not the only one with this issue.

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Community Beginner ,
Jun 11, 2019

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I have the same issue on both machines authorized for CC, and it renders my computer useless for about 20 ~ 30 minutes as the  CPU is pegged at 100%. Very frustrating, and completely negates the advantage in boot-speed I was seeking when I installed M.2 drives as the boot drives.

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Adobe Community Professional ,
Jun 11, 2019

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if you do not use cloud space disable syncronization.

Regards,
Abambo
Hard- and Software Engineer and Photographer

I'm not an Adobe employee. All advice constitutes my own opinion. Use at your risk! 🙂

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Community Beginner ,
Jun 11, 2019

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I have nearly 12GB of files on Creative Cloud. Cloud storage is very important to me. Adobe needs to fix this bug.

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New Here ,
Jun 28, 2019

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It would be nice if Adobe actually fixed this, but in the meantime you can limit the amount of CPU the process uses to prevent your machine hanging for 10 minutes at a time. You need to do the following;

  1. Open task manager (windows key + T or just search task manager from the start menu)
  2. If it opens in the reduced view, click on more details;
    file1.png
  3. Click on the Details tab
  4. Find CoreSync.exe in the list
  5. Right click and select Set priority --> Low
    file3.png
  6. Right click again, and select set affinity
  7. Uncheck <All Processors>
  8. Check just one processor

Hope this helps. It at least stopped the process from hanging my machine almost every morning.

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Community Beginner ,
Jun 28, 2019

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Just made this change, as it sounds VERY promising. I'll try it out for the next week and report back.

THANKS NICK!

--Kevin

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New Here ,
Apr 29, 2020

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SOLVED!
THis instance of CoreSync.exe with the adobe loge turned out to ba VIRUS.
It's a Bitcoin miner.  After getting rid of it no more issues. 
Nothing to do with Adobe.
Just google coresync.exe virus et viola...
CoreSync. If the location of CoreSync.exe is in a subfolder of the Windows folder for temporary files, then this mean that your system has been compromised to a Trojan Horse virus. The CoreSync Virus is a Cryptocurrency Miner. The Trojan Horse viruses are pretty common online infections.7 nov. 2019

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Community Beginner ,
Jul 12, 2020

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Not true unfortunatelly.

I have the same problem. On multiple devices (Win 10). CoreSync.exe is located in "C:\Program Files (x86)\Adobe\Adobe Sync\CoreSync". It is not miner Trojan. It is a genuine process of Adobe Creative Cloud bundle. 😞

I think it's caused by the loop in the syncing process. Because mine sync is forever stuck in 1748 files from 4714 and never moves up. Don't know how to solve it. 😞

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