OnComponentBeginOverlap causes draw call spike(and fps drop)

I have a simple landmine actor that overlaps pawns.

If you look at the stat unit numbers to the right, draws and prims spike wildly and the framerate dips on overlap. This is the blueprint:

I thought the overlap might be triggering multiple times or my explosion VFX was to blame, so I tried the DoOnce node and removed the explosion but the problem persists. I have different actors with overlap events and none are doing this. Does anyone have an explanation?