BigSur kernel_task +70% CPU 0: Vector 0x49(iMac14,4): 26259.16 interrupts/sec

Hi folks, after install kernel_task keep up 70% usage all the time (only one core, another one is ok)
My specs : Big Sur 11.6 / Asus Z97-E USB 3.1 / 8Gb DDR3 / Core i3-4360 3.7Ghz / IGPU 4600 - OpenCore 7.3 / iMac14,4

Kexts: SMCProcessor & SMCSuperIO +


I tried with FakeSMC. Same problem.

Any clue? Thanks!

PowerManager:




PowerMetrics results:

unable to get battery node
unable to get backlight node
unable to get backlight node
unable to get smc values...

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