more Efficient Gravity

Newbie & Debugging Questions
#1

My gravity script is extremely inefficient. Basically it brings down a 80 fps to a 4 fps by itself.

here it is:

public void Gravity(){
	y+=Minions.gravity;
	for (int i=0;i<c.size();i++){
		if (bounds().intersects(c.get(i).bounds())){
			if(c.get(i).destroyed==false){

				y=c.get(i).y-9;
	}
	
		}
	}
}

this gets called every frame
I know that it is the for loop that is causing all of the problems but i don’t know how to fix it