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Michael_Dutch
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September 1st, 2026 14:50
Degraded Performance After 25H2 Upgrade
We are seeing terrible performance after upgrading devices from 23H2 to 25H2. Tell tale sign has been slow clock speed usually averaging ~1.5ghz but dropping below 1Ghz down to 0.6Ghz in some cases. Also seeing cores parked while others at 100% usage. Devices are basically unusable in this state.
Devices include 5431, 5440, and 7340 and all drivers and firmware have been updated through support assist
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Posted September 2nd, 2026 14:14
Hello @Michael_Dutch
go to BIOS settings and uncheck/disable Intel SpeedStep.
Save settings and reboot.
Pls post results!
Peter
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Posted October 20th, 2026 14:52
@Michael_Dutch Did you managed to get to the bottom of this? We are in similar situation atm.
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Posted October 21st, 2026 18:53
@Stoyan_V1 not 100%. Appears to be something with Intel Dynamic Tuning and Innovation Platform components depending on what gen of processor. Also appears to have to do with the new user power overlays that sit in Settings > System > Power and Battery. These are only available if the power mode ( control panel power setting is set to "balanced", but setting the user overlay to "Best performance" also is resolving in some cases. Removing and reinstalling has also resolved but we dont have anything concrete against all models
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Posted October 21st, 2026 20:15
try this power mode - "Höchstleistung" in german language. Dont know the english name for this power settings.
Open cmd as administrator and run this command:
powercfg -s 8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c
HTH
Peter
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Posted October 21st, 2026 23:06
Peak performance is what it translates as.
Also I am being nagged to goto 26H2 in Windows, so we may get some more questions about that.
Kind Regards
anne_droid
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Posted October 22nd, 2026 10:54
i added the Peak Performance at Win10/11 setup, so all of my installations are not running into this problem. Tested on Win10 22H2, Win11 all versions.
W11 26H2 is running much better than 24H2 and 25H2.
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Posted October 30th, 2026 18:32
Re imaging to 26H2 seems to be better but I still don't hear any change in the fan noise under load. This for me is indication that the issue is not fixed. Something else I have been testing today is changing BIOS Thermal to Ultra performance and I get peak CPU power use at just over 47W with slow and steady drop to 17W which better that the 13W I was seeing before BIOS change.
anne_droid
6 Operator
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2620 Posts
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9651 Points
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Posted September 1st, 2026 15:40
Hi
Well there is bad news and well not much else really....
A snippet....
https://forums.lenovo.com/t5/Enterprise-Client-Management/T14-Gen-3-4-Performance-issues-after-upgrading-from-23H2-to-25H2/m-p/10031345
""most of our T14 Gen 3 and Gen 4 devices have started having performance issues after updating from Windows 11 Enterprise 23H2 to 25H2. It appears as if the device is not properly boosting the CPU cores like one would expect. At times I've seen where Task Manager will report the CPU clock is 0.6Ghz and will not boost beyond ~2.0 Ghz. With one test device in particular running an i5-1350P it should be capable of boosting to 4.7Ghz, but I never see it do that.""
So I am guessing that the Lenovo situation matches yours, and that being the case it would seem like a Microsoft problem, more than just a DELL/Lenovo situation to solve.
(edited)
Kind Regards
anne_droid