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Big Sur Update 11.6.4/11.6.5 CPU immediately began over heating greater 95ºC, Safari/Content near 200%

Immediately after updating to 11.6.4 and started up Safari got iStat Menus alerts that all CPU’s were heating over 95ºC(Did not get ScreenShots of initial temps). Activity monitor showed Safari, then "com.apple.Safari.ContentBlockerLoader (1258)”, then mdsync, and shut down 2014 iMac. Restalled Big Sur in recovery mode Hoping to get the earlier version before 11.6.4, but got 11.6.5. Usually get earlier, then notice to update; but, not this time.

Anyone know what is going on, and a fix?

This happened immediately after update. I will upload a few ScreenShots. It always happened when opening Safari, and then some extension or content of Safari would be at top of CPU% 140-190% for about a minute each time, then some other Safari content would show up at top. CPU temps “immediately” went from 40ºC to around 92-96ºC. Now it is showing mdsync when Safari is closed, and just idling except for Activity Monitor, and at 144% CPU, and high temps. Best, Seth

Posted on Apr 6, 2022 6:54 PM

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Question marked as Best reply

Posted on Apr 7, 2022 3:06 AM

1 - Suggest restarting in Safe Mode. This will perform a Disk Repair, clear cache files and only load Apple Software, extensions and fonts. The boot up will be slow and can take some time - Normal.


2 - Does the issue present in this mode ?


3 - If not - there could be something in the main User Account playing up. To further isolate this - Set up users, guests, and groups on Mac. Then log out of the Main User account and log into the dummy account and test again if the issue persists.


4 - If the issue is present in the dummy account - then, this appears to be a System Wide issue on the computer.


5 - Suggest downloading the Application Etrecheck directly from a well Respected ASC Contributor. And Safe to use.


The application is free or paid from added features. 


Run the application with Full Disc Access ( Security & Privacy - Full Disc Access ).



It will take a Snap Shot -  both the hardware and software.


 The Report will Not Reveal Any Personal Information. 


Post back the Full Report - copy and paste - using the Additional Text Icon ( 3rd Icon to last )



We can have a look at the report for possible issues and may have possible suggestions to resolve the issues.


Any Third Party Applications that will interfere with the normal operation of the OS, alter, modify, remove or delete or attempt to do so is an invitation for disaster and may require a Reinstallation of the OS in-order to replace any modified, altered, removed or corrupted elements of the OS this software has inflected on this computer 


Although some or all of these Applications maybe available on the Apple Apps Store, it does not mean Apple has verified what exactly the Application can do, does do or is doing to the Computer. That responsibility is left to the User to perform their due diligence on the Application before purchasing and installing it.


Any of the below should be removed as per Developers Instructions 


This includes AntiVirus, Disk Cleaners, Disk Optimizes, UnInstaller etc.


This will include CleanMyMac , This will include BitDefender


This will included Norton Antivirus , Sophos Av Software


Intego AntiVirus, McAfee, MacKeeper, Avast AntiVirus


Ad Guard, Webroot


The The Built in Security  is all that is required.

3 replies
Question marked as Best reply

Apr 7, 2022 3:06 AM in response to Seth77

1 - Suggest restarting in Safe Mode. This will perform a Disk Repair, clear cache files and only load Apple Software, extensions and fonts. The boot up will be slow and can take some time - Normal.


2 - Does the issue present in this mode ?


3 - If not - there could be something in the main User Account playing up. To further isolate this - Set up users, guests, and groups on Mac. Then log out of the Main User account and log into the dummy account and test again if the issue persists.


4 - If the issue is present in the dummy account - then, this appears to be a System Wide issue on the computer.


5 - Suggest downloading the Application Etrecheck directly from a well Respected ASC Contributor. And Safe to use.


The application is free or paid from added features. 


Run the application with Full Disc Access ( Security & Privacy - Full Disc Access ).



It will take a Snap Shot -  both the hardware and software.


 The Report will Not Reveal Any Personal Information. 


Post back the Full Report - copy and paste - using the Additional Text Icon ( 3rd Icon to last )



We can have a look at the report for possible issues and may have possible suggestions to resolve the issues.


Any Third Party Applications that will interfere with the normal operation of the OS, alter, modify, remove or delete or attempt to do so is an invitation for disaster and may require a Reinstallation of the OS in-order to replace any modified, altered, removed or corrupted elements of the OS this software has inflected on this computer 


Although some or all of these Applications maybe available on the Apple Apps Store, it does not mean Apple has verified what exactly the Application can do, does do or is doing to the Computer. That responsibility is left to the User to perform their due diligence on the Application before purchasing and installing it.


Any of the below should be removed as per Developers Instructions 


This includes AntiVirus, Disk Cleaners, Disk Optimizes, UnInstaller etc.


This will include CleanMyMac , This will include BitDefender


This will included Norton Antivirus , Sophos Av Software


Intego AntiVirus, McAfee, MacKeeper, Avast AntiVirus


Ad Guard, Webroot


The The Built in Security  is all that is required.

Big Sur Update 11.6.4/11.6.5 CPU immediately began over heating greater 95ºC, Safari/Content near 200%

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