Fremrate drops from 80 to 30 after 20 minutes of gameplay

chriswa2002

Honorable
Feb 24, 2017
177
4
10,695
Ive been experiencing some fps drops in rust, not other games, when i launch the game, it goes at 80 fps. but after 20 minutes of me playing it, the fps will decrease to 30 and not go up.
(it is not overheating i have water cooling)

processor: Amd FX(tm)- eight core processor
Graphics card: Radeon R7 260x
8gb ram
Windows 10