What should be the hardware requirements for solidworks to work smooth and fast?

The system I have has the following hardware spec:

Model: Dell Inspiron 15r

RAM: 8GB

Graphics Card: Integrated 2GB

OS: Windows 8

Inspite of this specification I am facing a serious lag issue in using the Solidworks software. I thought with the above said specs i should be able to use Solidworks 2013 smoothly. The major issue is I am not able to work fast on the system. U got to wait for quite some time after you select any object in the drawing. Even assembly in Solidworks is a major problem.

I hope to get some assistance regarding this issue.

Thank you.

SolidworksGeneral