I had the same thing. Before Iodine I was as slow-witted as everybody else. For example, I didn't notice that a store clerk did not know how to use the cash register. I just stood there, staring into space.
On iodine, I count faster and tolerate less incompetence. If a store clerk decides to chat about her last date with another clerk while I'm standing there, trying to buy socks, I interrupt immediately. I tell them, "hey, let's take care of this purchase."