I play rust with graphics turned all the way up, and over time my FPS will get worse and worse. The only way I know of to fix it, is to re launch the game, which is frustrating since Rust takes 10 years to load up.
Timeline of FPS performance on my machine:
1-30 Minutes: 60+ FPS
30-90 Minutes: 30ish FPS
90+ Minutes: 15-25 FPS
If anyone has any tips on how to maintain decent FPS over longer periods of play, I would be very grateful, thanks!