Odd issue with slowness in level editor

[LoneWolf]

Well my map in level editor is messed up, i place organic guardian slime and now my map runs so slow that i cant do anythign on it really, my cursor runs 30 secs slow, and my keyboard commands dont work right.

I've tried loading it up 4 times already, sadly i had saved it before it messed up. Any idea if it will resolve itself or if ive messed my map up until i can delete the entity?