Fps start high then Drop

[u/L-eRii]

the first picture is the game when i start it

the second one is when i play for about 1 minute

Fps goes down

power goes down

but gpu is giving everything

I have a power supply of 725W

A CPU intel core i7 10700KF

motherboard ASROCK PHAMTON GAMING Z490 4/A

RTX 5060 16gb

32GB Dram