Lancing steel performance issue

Hello.
I encountered with huge fps loss after using Lancing Steel of Spraying.
Fps going down pretty fast when it hits much monsters at the same time so after couple monsters packs you would have 10 fps for entire map until you reenter map(or die) and just waiting on map wont help.
I tried to find solution by using different supports (initially thought fps loss caused by returning projectiles but without this gem fps going down slower than with it)
After some tests i seems to fixed my fps problem by removing all Impale nodes from tree and now i am thinking that lancing steel of spraying(and maybe normal one) + impale causing this problem.