Web performance refers to time needed to download and display page on the user’s web browser. It is better for you to have short website load as possible.
To reach good load times it is important to load only required stuff. Use efficient approach and keep best practices and techniques.
You can test your actual website speed using Pingdom speed test tool. Then compare your grades to picture above. Not having good results? Let me know we can take look on your website and help it be get better marks.