[HELP] Big FPS drop in game and dont know what to do

Hey y'all !! im here today because im out of idea of what could be causing this problem :')

Disclaimer : sorry if my english is not that good , its not my main language

So my problem is : When i go into the game , first in the lobby everything is fine but when im in game after like a minute im starting to have a big fps drop like every 5 second , ive played game online and offline and its the same ... The temps looks a little high but nothing anormal as far as i know

im not a big player but here are some game that i have tried:

The new Avatar : cant even play the game , the ''lag'' is awfull

rust : im able to play but my brain is hurt from the image , still getting big spike

COD : getting some lag but not as bad as the other , its still playable

Garry’s mod : im not getting any lag in that one

Ive tried many thing :
Updating my drivers
i taught at one point that it was the ram or my ssd so i changed it to brand new one and better one
i reinstalled my pc
i did a downgrade from windows 11 to windows 10

nothing seems to work
if anyone have any idea im open , thanks !!

heres my config :
My pc is portable one , notepad i think you name it

Model : GP76 Leopard 10UE

PCU : Intel(R) Core(TM) i7-10750H CPU @ 2.60GHz, 2592 MHz, 6 cœur(s), 12 processeur

Motherboard : MS-17K2

GPU : GEFORCE RXT 3060 Laptop GPU

Ram : [ brand new ] Corsair vengence 2x16 gb ddr4
heres the link : https://www.amazon.ca/dp/B09KN7463D?psc=1&ref=ppx_yo2ov_dt_b_product_details

Storage :

1: [Brand new ] 931GB KINGSTON SNV2S1000G (SATA-2 (SSD)) Heres the link : https://www.amazon.ca/dp/B0BBWH1R8H?psc=1&ref=ppx_yo2ov_dt_b_product_details

2: 953GB Western Digital WDC PC SN530 SDBPNPZ-1T00-1032 (Unknown (SSD))

Operating system : Windows 10 Family

If theres some information missing tell me and i will add them .

thanks a lot !!!