Massive FPS drop using Oil Grenade + Explosive Grenade

Hi,

I am facing issues with the Oil Grenade and Explosive Grenade combo, as it causes a massive FPS drop to unplayable levels. As shown in the image, my FPS drops into the 20s due to the fire created by the oil. I normally get around 165 FPS, and this only happens when I use this specific skill combo, so I do not believe it is an issue with my PC.

My PC specs:

RTX 4070 Ti

Ryzen 5800X3D

32 GB DDR4

If anyone has a solution for this issue, I would really appreciate it. Thank you.