Task Manager: CPU Reporting Regression & Unreliable Task Termination in Windows Insider Preview Dev Channel Build 26120.3380


technoblade9007

technoblade9007

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I’ve identified a critical performance issue with Task Manager that’s impacting its core functionality. When left open for a few minutes, the interface begins to stutter, and the CPU usage metrics become significantly inaccurate. Even during stress tests—where I expect the CPU usage to reach 100%—the numbers are underreported, a behavior that was not present in previous builds.
This regression not only skews performance data but also undermines Task Manager’s reliability when terminating unresponsive or crashed tasks. Accurate monitoring is essential for system stability, so I respectfully request that the development team investigate and resolve this issue as a high priority.

Link: The Windows Insider Program

Please Upvote on this Feedback Hub Post so that Microsoft Notices this issue.
 
Windows Build/Version
26120.3380

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technoblade9007 said:
I’ve identified a critical performance issue with Task Manager that’s impacting its core functionality. When left open for a few minutes, the interface begins to stutter, and the CPU usage metrics become significantly inaccurate. Even during stress tests—where I expect the CPU usage to reach 100%—the numbers are underreported, a behavior that was not present in previous builds.
This regression not only skews performance data but also undermines Task Manager’s reliability when terminating unresponsive or crashed tasks. Accurate monitoring is essential for system stability, so I respectfully request that the development team investigate and resolve this issue as a high priority.

Link: The Windows Insider Program

Please Upvote on this Feedback Hub Post so that Microsoft Notices this issue.
Click to expand...
I would gladly upvote you but I can't duplicate the issue with the build mentioned.
I have 2 systems with it, both non-virtual, on which Task Manager was left running for about 30 minutes.
There was none of the abnormality you reported.
On how many systems have you observed this issue?
 

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I noticed it on 4 laptops which were all running the same build..are you using AMD or Intel? I am using Intel on all my PCs.
 

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technoblade9007 said:
I noticed it on 4 laptops which were all running the same build..are you using AMD or Intel? I am using Intel on all my PCs.
Click to expand...
Both. 1 AMD & 1 Intel.
Both on ASUS boards.
Also running 2 VMs with same builds (as both Beta & Dev are same builds right now)
I cannot replicate the issue on any of them.
Anyone else is seeing this?
 

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    All Branches but StableAMD Ryzen 7 7735HS 3200-4500 Mhz 8 cores x 232 GB DDR5Radeon Graphic / NVIDIA GeForce RTX 4060 8 GB...
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    All Branches but Stable
    Computer type
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    Manufacturer/Model
    Acer Nitro ANV15-51
    CPU
    AMD Ryzen 7 7735HS 3200-4500 Mhz 8 cores x 2
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    Sportage_RBH
    Memory
    32 GB DDR5
    Graphics Card(s)
    Radeon Graphic / NVIDIA GeForce RTX 4060 8 GB GDDR6
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    Integrated Monitor (15.3"vis)
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26120-3360 Changes and Improvements gradually being rolled out to the Dev Channel with toggle on*​

[Task Manager]​

  • We are beginning to roll out a change to the way Task Manager calculates CPU utilization for the Processes, Performance, and Users pages. Task Manager will now use the standard metrics to display CPU workload consistently across all pages and aligning with industry standards and third-party tools. For backward compatibility, a new optional column called CPU Utility is available (hidden by default) on the Details tab showing the previous CPU value used on the Processes page.

blogs.windows.com

Announcing Windows 11 Insider Preview Build 26120.3360 (Dev and Beta Channels)

Hello Windows Insiders, today we are releasing Windows 11 Insider Preview Build 26120.3360 (KB5052090) to the Dev and Beta Channels. As a reminder – we’re also offering the same Dev Channel updates based on
blogs.windows.com blogs.windows.com

maybe related:
https://www.reddit.com/r/Windows11/comments/1jaxqb1/psatask_manager_can_trick_you_to_think_cpu_is
 

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I'll try to perform a repair update on all my PCs and check if the problem still exists, and I will update here again.1742111487994.webp
 

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Windows 11 ProIntel Core i3-7020U12 GBIntel HD Graphics 620 (iGPU)
OS
Windows 11 Pro
Computer type
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Manufacturer/Model
HP
CPU
Intel Core i3-7020U
Motherboard
Hewlett-Packard
Memory
12 GB
Graphics Card(s)
Intel HD Graphics 620 (iGPU)
Sound Card
Realtek Audio
Monitor(s) Displays
HP Generic Monitor (Included with Laptop)
Screen Resolution
1920 X 1080
Hard Drives
EVM 128GB SSD (Windows Drive)
Toshiba MQ04ABF100 1TB Drive (Storage Drive)
PSU
Integrated PSU
Case
NONE
Cooling
Inbuilt CPU Cooler
Keyboard
HP Integrated Keyboard (Non-Backlight)
Mouse
Lenovo Mouse
Internet Speed
30 Mbps
Browser
Microsoft Edge
Antivirus
Bitdefender Total Security
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