Why is karma so slow?

Sometimes it is so hard to realize that being a good person and doing the right this will pay off. Especially when I see people who are so mean and selfish and vindictive and cruel getting the good things in life. And pointing fingers at me for being the bad person. I'm trying so hard to develop the SIU attitude and look at what's really important in the big picture, but it's so so so so so hard. Especially when we have to keep dealing with it every day. So I need prayers or good vibes or whatever that 1. he becomes a better person and 2. I can wait that long.