Win10 task manager cpu usage

[manchester love]

Hi I have win 10 In idle mode nothing open , just task manager on performance watching cpu I see it's good usage 0% but for a second I see cpu usage peaks up to 100% and cpu speed 4.6 After a second or 2 second , everything back to normall Cpu 0% or 1% and speed 1.6 .Is that normall

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