GPU and CPU aren't giving their full performance (50 - 65% only)

I have GF63 with RTX 4060 with intel i5 12th /32gb ram /512 ssd
the laptop is 3 months old
I tried :
Reinstalling drivers
disabling all frame limiters or v sync
change from Standby (S0) to Standby (S3)
changed power plan to high performance
changed nvidia power management mode to maximum
when I open the game it runs normally at first then performance declines along with cpu and gpu usage with no overheating .
the benchmark doesn't give me the results I expect but if anything was wrong with the gpu the game wouldn't work normally for the first few minutes when I run it .
PS: I didn't mess with any BIOS settings since I know nothing about them
Did anyone have the same problem and what are the fixes ??????