PC slow after fresh installing Windows 11

[Windows 11]

My cousin bought Mi Notebook 14. It has i5-10210U, 8GB 2666MHz DDR4 RAM, SATA3 SSD by Kingston. Recently it got very slow. The task manager kept showing less than 20% CPU utilization. Also less memory usage. Still the performance is noticably slow. Each click / UI interaction was laggy. I formatted the C drive and installed fresh Windows 11 Home Single Language (downloaded from Microsoft website) from scratch. But still the same behavior ! (24H2 complains: [1],[2],[3],[4])So I googled and found that Windows 11 update 24H2 has widespread complains for slowing down the performance. So

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