The author made it for Gunslinger Mod, but it is also suitable for the original game and other mods.

Throw along the way:

Stalker Call of Pripyatgamedataconfigscreatures

Instead of 12 hours, you can set any value (the default value is prohibitive and corpses accumulate throughout the game, because of this lags begin)

corpse_remove_game_time_interval = 12 ; in hours

stay_after_death_time_interval = 12 ; in hours