Low fps when doing bush trips

and like in your former topic about , you get us no additional informations.

What’s your system specs ( e.g. your topic about that you own still a hdd, let me assume it’s bit older ) ?
What about your in-game settings ?
What are your FPS in case “no bush trip” ? ( these 20 ?.. then 13fps may be normal )

Have you checked topics like :