To put it into an analogy;
A man takes his fiat 500 to the shop to have it souped-up, two weeks later he comes back and is disappointed with the car. So, he says to the mechanic, “you said you could make my car faster.” The mechanic looks at the car and then to him and says, “It’s the fastest fiat in town, if you wanted it to go as fast as a Ferrari you should of brought me a Ferrari.”
The morel of this story is don’t bring me a fiat and expect me to make a Ferrari out of it.