FPS drop in an empty scene after a while ( 10 sec )

I have a problem in Unreal Engine. When I start an empty level, my fps is set to about 120 and delay 5ms. In 15 seconds my fps dropped by 40 and the delay was set to 20ms.
i’m running Unreal on Laptop
rtx 4050ti 6gb
i5 13500h
16 ram ddr4
I try change graphics setting but graphics do not affect this bug at all

What power setting do you have ( in Windows )?

I find my solution . in my character BluePrint i try add HUD to view port with Even Tick)

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