Windows 11 still has performance issues on Intel Ultra series CPUs, and such performance issues seem very strange in themselves, such as a large decrease in CPU performance when the application window is minimized.
The issue, which was first discovered by users of technology website Borncity, is difficult to detect unless users perform tasks using certain applications and observe CPU usage in Task Manager.
This netizen is using an Intel Ultra 9285K processor. When tasks such as applications are minimized, Windows 11 will enter an unknown power-saving mode, because at this time the CPU enters a state of low usage and substantial frequency reduction.
This was confirmed by netizens using the comprehensive stress testing software Prime95 and 7-Zip benchmark tests, that is, everything is normal when the window is in the foreground state, but once it enters the background state, the CPU immediately downclocks, causing performance degradation.
Let's take a common example in reality: For example, now I need to compress eight 5GB ISO images, and each file is compressed into its own 7Z. At this time, if I minimize all the compression windows so that they can be executed in the background, the compression time will be greatly extended.
IntelCoreUltra9285K: Core usage with application in foreground window, sustained 100%, 4.42GHz
IntelCoreUltra9285K: When the application is minimized and enters the background, the core usage drops to only 23% and 1.86GHz.
In the actual test, in addition to the window being minimized, the same is true when the application is not in focus (that is, becomes an inactive window), which can be seen from the CPU status of the Task Manager.
According to the Windows 11 CPU support page, the Intel Ultra 9285K processor is fully supported by Windows 1124H2, so this error may be caused by Microsoft.
The same test conditions do not exist on Intel Core 9-12900K and AMD RYZEN99950X. I don’t know if this problem is related to Intel Ultra’s lack of hyper-threading. Windows 11’s support on Intel’s new CPUs has not been very good, and there have been problems with core scheduling before.