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Kudos0

One Instance of NortonSecurity.exe High CPU

Hello,

Every time we get a new patch it seems to break my Norton installation. My computer's Norton Security.exe real-time service keeps running an average of 15% CPU or higher every time I surf the web or perform basic tasks. Norton support has told me to do the complete remove reinstall installer which I have multiple times and it has not fixed the issue. Anyone else experiencing this? This is the only antivirus software that I have seen do this and I do not know how to resolve this issue. It has happened with every Norton Internet Security Build that has come out within the last year.

Thanks for your time and help,

CyberNinja15

Replies

Kudos0

Re: One Instance of NortonSecurity.exe High CPU

Hello CyberNinja15. What is the build and version of your Windows 10 install? Do you happen to be running an insider build? Do you have "fast startup" enabled or disabled on the system?

Cheers

Retired military (Navy 1980-2002) AO1 (AW) Aviation Warfare Specialist "From DOS to Windows10 what a journey it has been" / MS Certified Professional / Windows 10 Professional x 64 version 1809 / build 17763.437 / NCSP 22.17.0.183 / Norton Core v.282 on Android 1.93
Kudos0

Re: One Instance of NortonSecurity.exe High CPU

When you get Norton updates with a new version, be sure you run LiveUpdate manually a few times, restarting as necessary, until no updates are available. The latest product update announcements note that it can take multiple LiveUpdates and system restarts to get the product fully updated.

Things happen. Export/Backup your Norton Password Manager data.
Kudos0

Re: One Instance of NortonSecurity.exe High CPU

I have Win10 v1803 Education, Slow Update channel (What the Enterprises use), and Fast Startup would be at the setting default for SSDs. The bootup of Norton doesn't affect my startup. It just spikes when I use web browsers especially Google Chrome and I cannot figure out why.

Kudos0

Re: One Instance of NortonSecurity.exe High CPU

Right, I make sure to get the latest LiveUpdates and perform restarts. However, the CPU immediately drops when exiting out of my web browsers. I also noticed that sometimes the Microsoft Compatibility Service runs simultaneously when the CPU spikes from Norton. Any ideas why?

Kudos0

Re: One Instance of NortonSecurity.exe High CPU

Sounds like a browser extension may be causing what you are seeing. Check your extensions and disable one Norton extension at a time and test with the browser running. When you no longer see the high CPU use, you will know what is causing the issue.

Things happen. Export/Backup your Norton Password Manager data.
Kudos0

Re: One Instance of NortonSecurity.exe High CPU

Attached is my extensions from Google Chrome. I disabled them one by one and the CPU usage is still high.

Kudos0

Re: One Instance of NortonSecurity.exe High CPU

Kudos0

Re: One Instance of NortonSecurity.exe High CPU

As you disabled each extension, did you close the browser to reset it?

Things happen. Export/Backup your Norton Password Manager data.
Kudos0

Re: One Instance of NortonSecurity.exe High CPU

I closed the browser each time and the problem occurred with each one disabled. It is not the extensions. Thanks bjm_ for how to post the image in the forums. What should we try now peterweb? How can I provide you the nortonsecurity.exe task manager capture file for review?

Kudos0

Re: One Instance of NortonSecurity.exe High CPU

First I would try disabling all your browser extensions to see if you still see the higher Norton CPU usage. It could be one of your extensions that is triggering Norton to do some extra scanning. If the CPU usage goes down after this, try enabling the extensions one at a time, restarting the browser each time and check the CPU usage. When you find one extension that spikes the CPU again, you should have found the culprit.

Things happen. Export/Backup your Norton Password Manager data.
Kudos0

Re: One Instance of NortonSecurity.exe High CPU

The CPU spikes when no extensions are loaded. It even happens in incognito mode.
Kudos2 Stats

Re: One Instance of NortonSecurity.exe High CPU

Do you see this with all browsers? Which ones are you using? 

and Fast Startup would be at the setting default for SSDs

Not sure where you have seen this information. Windows Fast Startup feature has no difference between SSDs and regular HDDs. It still may be affecting your issue. Best to turn it off and test. If you use Windows 8/8.1 or 10, there can be an issue with the Windows Fast Startup feature.. See more information here.

Things happen. Export/Backup your Norton Password Manager data.
Kudos0

Re: One Instance of NortonSecurity.exe High CPU

I use Google Chrome and Firefox. Fast startup is disabled as I disabled hibernation.
Kudos0

Re: One Instance of NortonSecurity.exe High CPU

Lets see what others can suggest.

Things happen. Export/Backup your Norton Password Manager data.
Kudos0

Re: One Instance of NortonSecurity.exe High CPU

Hi CyberNinja15:

What type of CPU do you have? If it's a quad core with hyperthreading (i.e., 4 physical cores with 2 threads per core) and consumption of CPU activity by nortonsecurity.exe always peaks at ~ 12% as shown in your image <here> that probably means this executable is saturating one thread (100 / 4 x 2 = 12% CPU activity).

Go to Settings | Administrative Settings | Background Tasks | Configure and leave that window open for a few hours to see if you can catch one of the Norton tasks with a Status of Running during one of these periods of high CPU by nortonsecurity.exe.  I don't know if your problem is related, but there seem to be quite a few users complaining about these Norton background tasks since the latest v22.17.0.83 (released 11-Mar-2019) started rolling out.  From migron's 22-Mar-2019 post in Automatic Background Tasks Not Working:

"Yesterday (21st) both seemed OK except Password Manager Backup did not run on either, over 24 hours since last run, this seems to Backup in the background as opposed to waiting to Idle."

There could also be a scheduled task at Settings | Task Scheduling | Scheduling (e.g., browser temp file / history cleaning or a disk defrag) or a scheduled Full System Scan (Settings | Antivirus | Scans and Risks | Full System Scan | Configure) trying to run outside of system idles and consuming high CPU.


I've also heard of instances in the past where Norton's real-time heuristic (behaviour-based) protection would "wake up" and start monitoring a harmless Microsoft background task and cause CPU activity by nortonsecurity.exe to spike.  See the thread CPU Usage About 30%, where multiple users discovered that CPU activity by nortonsecurity.exe would increase dramatically every time their Microsoft .NET Framework optimization service (which only consumed ~ 0.2% CPU) started running in the background.  Most of those user had MS Visual Studio installed, and all were able to stop the high CPU activity by nortonsecurity.exe by disabling unnecessary Native Image Generator (NGEN) optimization tasks in the Task Scheduler.

I'm wondering if the Microsoft Compatibility Service you mentioned <here> is causing a similar issue.  I don't have a Win 10 OS and don't know much about this service but a Google search showed that this service has a reputation for causing high CPU and disk usage problems - see Microsoft Compatibility Telemetry, What is it and Why is it Spiking my CPU Usage Up? in the MS Answers forum as well as the EaseUS support article How to Fix Windows 10 Microsoft Compatibility Telemetry High Disk Usage.  I assume your Win 10 Education edition would be able to make the Group Policy Editor changes described in that EaseUS support article to temporarily disable Microsoft Compatibility telemetry to see if that is triggering the high CPU activity by nortonsecurity.exe.
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32-bit Vista Home Premium SP2 * Firefox ESR v52.9.0 * Norton Security Deluxe v22.15.1.8

Kudos0

Re: One Instance of NortonSecurity.exe High CPU

Thanks for the suggestions. I will try to see if those will eliminate the issue. It seems to happen every time a patch comes out.

Kudos0

Re: One Instance of NortonSecurity.exe High CPU

lmacri:

....There could also be a scheduled task at Settings | Task Scheduling | Scheduling (e.g., browser temp file / history cleaning or a disk defrag) or a scheduled Full System Scan (Settings | Antivirus | Scans and Risks | Full System Scan | Configure) trying to run outside of system idles and consuming high CPU...

Hi  CyberNinja15:

Again, I don't know if this is related to your issue, but Guru Krusty13 (Win 10 Version 1809) just posted this in the thread Norton Security 22.17.0.183:

...On the machine still running Norton my 'scheduled' Full System Scan did not start for 20 minutes after it was scheduled...

Be sure you disable the Windows Fast Startup feature peterweb mentioned <above> and then re-boot a few times to ensure the change takes effect - see the TenForums tutorial How to Turn On or Off Fast Startup in Windows 10.  This Fast Startup feature (also called hybrid boot-up / hybrid shutdown) can interfere with product updates and loading of Norton services and drivers at boot-up and result in all sorts of odd glitches and unexpected behaviour on Win 8.x and Win 10 computers.  If you previously disabled this power option just confirm that it's still turned off, since Fast Startup can sometimes re-enable itself after a major Win 10 update like a Version change.
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32-bit Vista Home Premium SP2 * Firefox ESR v52.9.0 * Norton Security Deluxe v22.15.1.8

Kudos0

Re: One Instance of NortonSecurity.exe High CPU

I was also wondering about the new Wi-Fi Security feature listed in the product announcement release notes at Norton 22.17 for Windows is Now Available!, which states:

"Wi-Fi Security Detections: This technology has been added to alert and educate the user if we detect Man-in-the-Middle, SSL Stripping, or ARP Spoofing events."

According to the support article for Android devices Wi-Fi Security Feature in Norton Mobile Security "Wi-Fi Security automatically performs a security check every time your device connects to a Wi-Fi network".  Does anyone know if the new Windows PC version of this module runs continuously in the background (i.e., does it monitor your internet connection in real-time) and is there any way to temporarily disable this feature?  OP CyberNinja15 notices the high CPU activity by nortonsecurity.exe when they are browsing the internet, so could this new Wi-Fi Security feature be involved?

I don't have the latest NS v22.17.0.183 so I can't test on my own system, but the support article Message: "Unsecure Wi-Fi Detected" seems to imply that the main function of this feature on the Windows PCs is to check the encryption level (e.g., WEP, WPA2, etc.) of your WiFi connection.
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32-bit Vista Home Premium SP2 * Firefox ESR v52.9.0 * Norton Security Deluxe v22.15.1.8

Kudos2 Stats

Re: One Instance of NortonSecurity.exe High CPU

Hi Lmacri,

Here's a screenshot showing individual components can be disabled.

Here's the related KB  -  https://support.norton.com/sp/en/us/norton-security/22.17.0.183/solutions/v127924781_ns_retail_en_us

That's about all the information I have, but I hope that helps.

A little bit of knowledge is... well a little bit of knowledge.
Kudos0

Re: One Instance of NortonSecurity.exe High CPU

Hi All,

I have tried doing a complete advanced uninstall of Google Chrome with my System Mechanic uninstaller. It wiped out Google Chrome completely. I am going to continue monitoring this to see if the issue reappears. So far, it may have helped mitigate the issue along with enabling the disable of Telemetry service in Group Policy.