Think of it this way. During a conversation a person can speak without interruption if everything being talked about is in his or her memory. However, if a person does not have enough memory and has to look something up during the course of the conversation, in a book or newspaper, then the conversation stops until the needed information is found. The more interruptions the computer receives to retrieve information the slower the computer. The more memory a computer has, the fewer interruptions and the faster the computer operates.
More memory equates to more speed.
The more the better. Here are a few general ideas. The more a computer is asked to do the more memory it requires. Well, in the world of computers it never seems to be that easy. The following list provides just some of the different types and configurations of memory available.