Olympus Grass FPS DROP

Olympus is easily my most hated map in the game because it's nearly impossible to fight in certain areas. I'm running 120-140 FPS almost everywhere else but as soon as I look at any grassy areas on Olympus it tanks down to 60 and sometimes even as low as 30, especially during firefights. Lowering my graphics settings does NOT fix this issue, therefore I'm sure this is NOT a performance issue but rather a serious bug/optimization issue. This has persisted since the map was introduced back in season 7 and has not been addressed for almost a year and a half now.