Performance problem when Explosive grenade explodes

Running otherwise 144fps, but whenever I shoot 5 projectiles of Exploding Grenades and those explodes my fPS dips down to 90. If I shoot multiple sets of those 5 projectiles and all of them explodes my fps goes down to 20fps.

GPU frame time rises from 4ms to 20ms+ when those explosions goes off.

Win 11 24H2
Ryzen 7800X3D
RTX 4070 super