Very weird slowdown.

My game got slow out of nowhere and I found out why, this simple line:

Colission between "Shooter" and "Wall" = Subtract 1 from Alterable value A.

I dont understand, this is such a simple comand, and I can't find another solution for what I want to do.

But believe me, game got VERY slow, just because of this.

Can you upload the game or a example ? ;)

Problem dissapeared... completely.

So lets just pretend it never happend xD