I can confirm that when FPS drops, changing the settings (texture detail) will restore your original performance.

Hello, I tried everything according to your instructions, but unfortunately the problem still persists.
My drivers are up to date.
I have observed this problem already with the first version 1.3 released in December.
I do not have this problem with the stable version.
I played in SP Game master mode, searched dozens of dead bodies and everything seemed fine. Then I started SP Conflict mode and the FPS crashed
It happened at the start of the mission.
Thank you.

The shovel disappears from your hand if you press SHIFT.

The AI will sometimes leave their positions and attack the enemy outside the base. It will not return to its original place.