CMFSyncAgent constantly running after upgrading to Ventura. (CPU 96%)

Just finished my chat with apple support and they suggested to reset your SMC Reset the SMC of your Mac - Apple Support. I did that and so far so good, no CMFSyncAgent after restart (usually it pops up right away). Will update the progress later by the end of the day.

Update:

Stay logged out from iCloud didn't create CMFSyncAgent process (you can't find it on Activity Monitor). From my observation, it seems the process is only created when you're logged in to your iCloud account. Logging in and off the account doesn't help either, unfortunately. It's possible that one of the services (contact, notes, safari, siri, etc) that iCloud is trying to sync is the cause of the problem. However, it takes time to find out which one as the fastest way to test which one is to restart my machine, because once the CMFSyncAgent is hogging the CPU, it's kind of impossible to kill and need to wait for the process to kill itself.

Also another interesting fact that I notice from this problem is all (as far as we know) occurs in intel machine. Mine is also not the M1 machine.

So for now, I've decided the quickest solution is to log out my iCloud account and if I have time continue finding out which one of the services causing the problem. Hopefully this will get fix on the next OS upgrade.

Thanks for letting me know! I re-logged in to the iCloud account and turn off my google account within the contacts app and it's been an hour without CMFSyncAgent hogging the CPU. Might deep dive to the contact entries sometimes later to find out which one is the culprit.

Hello guys,

I have also this problem with my 16" macbook pro of 2019 (Intel) since i updated to MacOS Ventura, like you i never had this problem before with older versions of MacOS (before Ventura).

I made a feedback report on the Apple website under MacbookPro's feedbacks (Feedback - MacBook Pro - Apple) and also a bug report on the bug developper feedback system (https://feedbackassistant.apple.com/).

I would recommend you to do the same, more the feedbacks Apple will receive about this problem, more they will look into it.

I already saw the website of MacRumors telling about disabling the Google Sync on the Contacts App, but the only difference is for me, that i don't have any Google Account connected to my macbook, and i have the problem too.

At that time when i'm writing this, the CMFSyncAgent enabled itself for the 2nd time, 85°C of CPU Temp and fans blowing at full speed...

Any help from the Apple Forum team would be appreciated and i hope that we will get an update soon about this problem..

I have this problem too, it has been going on ever since I upgraded the OS (didn't happen in Big Sur). Initially I thought this is some sort of indexing process from apple new system as it manages to stop after I left the computer doing nothing for 30-60 minutes. However, the process restarted by its own and doing its thing again after a while (10 mins perhaps). This has been quite frustrating as my machine gets noticeably slow during this time.

Sorry for the late update. No it didn't. It still pops up after a while. The new solution from them is to deactivate find my mac and log out from iCloud. Only deactivating find my mac didn't really resolve the problem, currently I'm testing the log out solution. So far no CMFSyncAgent, I'll update tomorrow whether the problem still persists.