CSISYNCCLIENT.EXE consuming CPU on Win 8.1 (Microsoft Office Document Cache Sync Client Interface)

Anonymous

Hi,

I constantly show a very high CPU usage on the CSISYNCCLIENT.EXE process (MS Office Document Cache Sync Client Interface). This is very frustrating and slowing down things on my laptop.

Does anyone know how to fix this?

Pls help.

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Anonymous

I managed to narrow it down to OneDrive that was causing the issue. After reading Millewa's post I hunted down a way to delete the cache, and so far so good. Fingers crossed as this has been dragging out over a few days now.

I followed these steps to delete the cache (yes - I know its for SkyDrive but it still worked)

To clear your cache, close all your Office processes like groove.exe (which is SkyDrive Pro), msouc.exe, msosync.exe, office library sync,

Browse to “C:\Users%username%\AppData\Local\Microsoft\Office\Spw” and delete all the content. (You will see that this is all related to groove and spw = SharePoint Workspace).

Next, go to “C:\Users%username%\AppData\Local\Microsoft\Office\15.0\OfficeFileCache” and also delete all content from this folder. This is where all the caching from your files are stored.

After you deleted everything, you should be able to start SkyDrive Pro again (using “C:\Program Files\Microsoft Office\Office15\GROOVE.EXE“).

Good luck! I will re post if it starts playing up again :|

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Anonymous

Hi all,

I just suffer the same issue with my original surface pro 128G (win8.1)

I check the task manager which show a lots of CSISYN~1.exe execute in background and CPU usage is 100%.

I try to dig out some solution by google and short summary as below.

1.Unchecked****the option "Use Office to sync files faster and work on files" in onedrive( sky drive)

But it didn't work for me due to I even cannot find the setting option in my onedrive setting.

2. Removal/reinstall the office 2013 or office 365.

It work but when I re-install the office, the issue come back again.

3. Removal the skydirive or onedirve app/ program

As you known, the ondrive is default app in win8.1. however, I still find a skydirve program in programs and features of control panel.

Therefore, I try to uninstall and remove it. -----> it work. no more CSISYN~1.exe abnormal execute in background and everything normal.

For you all reference.

Thanks

Arthur

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Anonymous

Dear All,

I actually worked with a second-level Microsoft technician today (for about four hours, via phone and LogMeIn), and the problem was actually solved. The cache used by OneDrive (MSO cache) was corrupted. The installation of Office 365 was completely removed, and a clean install then worked. I was not following all the details as the technician worked on the computer via LogMeIn, but I can say that in my particular case, the Csisyncclient.exe problem resulted from a corrupted cache.

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49 additional answers

Anonymous

2015-10-21T10:32:25+00:00
Hi,

I constantly show a very high CPU usage on the CSISYNCCLIENT.EXE process (MS Office Document Cache Sync Client Interface). This is very frustrating and slowing down things on my laptop.

Does anyone know how to fix this?

Pls help.

VB

Hi after having this problem for well over a year, I finally discovered that it was caused by a bug that Microsoft shipped out in an update. Take a look at this post copied from this thread...

If you are still having this problem can you contact Andrew Tischaefer directly!

CSISYNCCLIENT.exe keeps crashing repeatedly & causing WER to burn the disk

Andrew Tischaefer \[MSFT\] replied on
- Microsoft
Hello and thank you for the report.

I can't speak to the specific issue that started this thread back in 2013, except to say that we do pay attention to these reports and actively work on investigating and resolving problems with the CSISyncClient, which as many have guessed is one of the components that Office uses the coordinate sync with the OneDrive application.

What I do want to talk about is the more recent addendums to this post, starting in May 2015.

In the May 2015 update for Office 2013 and Office 365, we shipped a bug in this component that caused significant crashing and, for some users, CPU spikes. The bug was related to specific update cases and we are updating our test procedures to ensure future issues like it do not get past us.

We did proactively make some posts on Answers so that people that hit this problem could search and self-help. This thread was missed. For that, I can only apologize.

We resolved this crash as part of the June update, which shipped a couple of weeks ago. I strongly encourage those of you who are still experiencing this problem to update to the latest version per these instructions: https://support.microsoft.com/en-us/gp/office-2013-365-update?wa=wsignin1.0

Thank you for your business and again, sorry for any inconvenience.

Andy Tischaefer

Engineering Manager, Office

Hopefully this will put the CSISyncClient problem to bed, once and for all!

Regards,

Peter Creed
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Anonymous

2015-09-06T15:07:38+00:00

Re: The CSISYNCCLIENT respawning problem...

Thanks for that helpful reply Dai.

I have been having this problem with OneDrive on Windows 7 for well over a year now. It is so severe that it has stopped me using OneDrive Altogether and I virtually no longer use Microsoft Office, One Note or OneDrive. I spent four hours on the phone to the US from the UK trying to get Microsoft to fix this and I just got batted round in a departmental loop for four hours until I ended up back in the same department, then the line went dead. For a supposed "World Class" company their ability to fix this problem truly sucks...

I used OneDrive from my home based one man operation and Outlook has so much of my business data in it that I'm terrified to unistall Microsoft Office 365 and reinstall it in case I lose all my data and cannot re-import from my PST file. I've tried every other solution I can find on the web to no avail.

In the end I completely gave up and started using Libre Office, DropBox, and Evernote as my productivity tools. Someone at Microsoft really needs to read this thread and get this problem sorted out!

I'll give it one more try and leave the machine on as you suggest Dai. I appreciate your input!

I'll update the thread if I get a positive result.

Afterthoughts...

If anyone can point me in the direction of correctly backing up and restoring the data in Outlook from Office 365 I would greatly appreciate it!

Peter Creed

Peter

The other thing that worked for me was renaming CSISYNCCLIENT to CSISYNCCLIENTa.exe and then stopping it. Onedrive continued to work perfectly BUT I could not gen an answer from anyone in terms of what I was disabling by stopping MSOSYNC and CSISYNCCLIENT from running.

I obviously could not guarantee an uninstall or repair for 365 but everyone of my attempts restored office perfectly (including outlook) and kept all of my previously used files, pinned files and templates.

Good luck!
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