Dell.TechHub.Instrumentation.SubAgent and Dell.TechHub.DataManager.SubAgent are consuming the whole system resources

Hi albgen:

Is your Latitude 3520 still under warranty?

What is the version and OS build of your Windows operating system [open a Run dialog box (Windows key + R) and enter winver] and current BIOS version?  To find your current BIOS version open a Run dialog box, enter msinfo32 to open your System Information, and look for the field named "BIOS Version / Date" in the summary.

If you go to Control Panel | Programs | Programs and Features does it show that the current SupportAssist v4.8.2 is installed on your system?

The Dell TechHub service is used by SupportAssist to run diagnostic hardware scans.  Does your high CPU and RAM usage disappear if you turn off automatic background hardware scans in your SupportAssist settings at Settings | Scans and Optimizations (see the SupportAssist v4 User Guide <here>) and re-boot your computer?

NOTE: While you are testing please do not run a manual hardware scan from the Home panel of SupportAssist since this will likely trigger your high CPU and RAM usage again.

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FYI, I removed all SupportAssist-related programs from my Inspiron 5584 after my service warranty expired because they were too buggy and consumed too much RAM, CPU and other system resources.  I also found the "system optimization" scans in SupportAssist (Clean Files / Tune Performance / Optimize Network) were too aggressive and had the potential to do more harm than good.  See my 08-Feb-2025 post in ygil's BSOD Issues After Windows Updates for further details on the steps I took to replace the functionality of these buggy programs.

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Dell Inspiron 15 5584 * 64-bit Win 10 Pro v22H2 build 19045.6216 * Firefox v142.0.0 * Microsoft Defender v4.18.25070.5-1.1.25070.4 * Malwarebytes Premium v5.3.6.205-138.0.5346 * Macrium Reflect Free v8.0.7783 * My Dell v2.2.6.0 * Fusion Service 2.2.14.0

hi,

i don't think is in warranty.

Versione/data BIOS Dell Inc. 1.41.1, 30/04/2025

have not tried to  turn off automatic background hardware scans...

i don't think is in warranty.

Hi albgen:

If you want to confirm go to https://www.dell.com/support/home/en-us/products and enter your unique Service Tag.  That should redirect you to your Latitude 3520 support page and display the expiry date of your service warranty.

have not tried to  turn off automatic background hardware scans...

FYI, andyksfb96d9 just started a new topic at SupportAssist 40% CPU about high CPU consumption by Dell.TechHub.DataManager.SubAgent.exe on their Inspiron 7506 2-in-1. 

Nirmal Tej Katta also reported in their 20-Aug-2025 topic Support Assistant scan hardware issue that their hardware diagnostic scans would repeatedly fail to run to completion on their Inspiron 14 5410 2-in-1.  Unfortunately, they tried to solve the problem by performing a system rollback using Dell SupportAsssist OS Recovery v5.5.x (which caused even more problems and put their computer into a repair loop) before I could provide any suggestions on how they might fix their SupportAssist problem.

Be sure to post back and let us know if your high CPU and RAM consumption stops after you turn OFF automatic background hardware diagnostic scans in your SupportAssist settings and re-boot your system.  If we can confirm your problem is associated with your SupportAssist hardware scans then we have to consider the possibility that all three of you recently started having problems with your Dell TechHub service because of a connection failure to a backend Dell server that can only be fixed by Dell.  It might not be a coincidence that all three of you live outside North America.

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Dell Inspiron 15 5584 * 64-bit Win 10 Pro v22H2 build 19045.6216 * Firefox v142.0.0 * Microsoft Defender v4.18.25070.5-1.1.25070.4 * Malwarebytes Premium v5.3.6.205-138.0.5346 * Macrium Reflect Free v8.0.7783 * My Dell v2.2.6.0 * Fusion Service 2.2.14.0

Hi there

We are also experiencing this issue with high CPU and RAM usage, killing the process and setting the service to manual rather than automatic is a work around but is not ideal, this is using version 5.5.0, will there be a fix for this going forward?

The laptops are not in warranty and have windows 11 installed

We are also experiencing this issue with high CPU and RAM usage, killing the process and setting the service to manual rather than automatic is a work around but is not ideal, this is using version 5.5.0 ...

Hi P_diddy07:

Could you clarify what Dell software you are referring to?  I removed all SupportAssist-related software from my Insipron 5584 (they were too buggy and consumed too much CPU and RAM - see my 08-Feb-2025 post in ygil's BSOD Issues After Windows Updates for further details) but AFAIK SupportAssist for Home PCs v4.8.2 is the latest version.  Go to Control Panel | Programs | Programs and Features (i.e., not Settings | Apps) to find your current Dell SupportAssist version.

The Task Manager image in OP albgen's original 21-Aug-2025 post <here> shows a severe memory leak (i.e., 6 to 12 GB of RAM consumed) by the Dell.TechHub.Instrumentation.SubAgent and Dell.TechHub.DataManager.SubAgent processes that grows over time after each system restart until it crashes their system.  Are you seeing a similar memory leak, or does your CPU and RAM usage by these executables just seem excessive to you?

Regardless, you might want to try a clean reinstall of SupportAssist on one of your machines to see if this fixes your problem. See the support article Dell SupportAssist for PCs and Tablets Installation Issue for instructions.

Just FYI, the documentation for SupportAssist for Home PCs at https://www.dell.com/support/product-details/en-us/product/dell-supportassist-pcs-tablets/resources/manuals was recently updated in September 2025 for SupportAssist v4.8.x but there is still no mention of any excessive CPU and/or RAM consumption by these Dell TechHub executables in the Known Issues section of the v4.8.x release notes.  As of today I haven't seen any post by a Dell employee in this forum that suggests Dell is working on a bug fix.
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Dell Inspiron 15 5584 * 64-bit Win 10 Pro v22H2 build 19045.6332 * Firefox v142.0.1 * Microsoft Defender v4.18.25070.5-1.1.25070.4 * Malwarebytes Premium v5.3.8.212-140.0.5364 * Macrium Reflect Free v8.0.7783 * My Dell v2.2.6.0 * Fusion Service 2.2.14.0