MRT process high CPU usage

Question

MRT process high CPU usage

Hi everybody. I use Mac Mini 2010 Core 2 Duo 2.4 GHz, 8 Gb RAM and fresh installed SSD running High Sierra 10.13.6(installed 2 weeks ago). Recently I found out that MRT use 150-190% of CPU after every start. Sometimes it takes 3-5 minutes and process disappear from Activity Monitor, sometimes it’s constantly working, very rarely everything works fine. I have already reset SMC, PRAM, used Disk Utility First Aid, used Safe Mode, checked with Malwarebytes (nothing found as expected), used Onyx - with zero result.

Also I found that after 1-1.5 hours of Mac being unplugged from power supply, rpcsvchost process starts running after startup with about 100% cpu usage (around 10 minutes). In this scenario MRT runs other 90%. After rpcsvchost finished his work, MRT return to 160-190%.

Of course I can quit MRT in Activity Monitor but its definitely not a proper solution. So I’m glad to hear any suggestion!

Posted on Jan 6, 2022 5:29 AM

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Answer 1

jdo_apple

Community Specialist

Jan 7, 2022 7:31 AM in response to duranduran297

Hello duranduran297,

Thanks for that info and for choosing the Apple Support Communities. If we understand correctly, you are having an issue with a process taking up more CPU cycles on your Mac mini than expected. First, try running First Aid on your hard drive with the built in Disk Utility tool, as this can correct simple issues like you're experiencing.

How to repair a Mac disk with Disk Utility

Next, use safe mode to start up your Mac as it does the following things:

Verifies your startup disk and attempts to repair directory issues, if needed
Loads only required kernel extensions
Prevents Startup Items and Login Items from opening automatically
Disables user-installed fonts
Deletes font caches, kernel cache, and other system cache files

Log in to your user account and test the issue while in safe mode and then restart normally and test the issue again.

How to use safe mode on your Mac

Graphics performance limited in macOS Recovery, safe mode, or Guest User mode

Cheers!

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MRT process high CPU usage

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