Hi

1. How to do load testing and performance testing for our newly  developed share point 2013 Intranet portal before going to live, ?

2. After based on these results its good idea to improve hardware specifications like RAM,CPU?

can i get below results from above testing

- how many users request per second ,

-latency ,

-average number of users per day

Take a look at the following articles.  YOu can use Visual Studio Test Edition to conduct this kind of performance analysis.

http://blogs.technet.com/b/meamcs/archive/2013/06/16/web-performance-load-testing-sharepoint-2013-for-beginners-part-1.aspx

http://spperformancetest.codeplex.com/