Could any one explaion me why the response time was slow while browsing through the load runner
There is difference between the browser navigation of the application to fetch corresponding transaction response time and loadrunner processed response time. Because in the browser it maintains the cache and simplye loads the data , for the first time it will consume the time to do the page rendering and buffering ...etc. and then it loads more faster.
As the LoadRunner will make the calls using API level , with it involves the server respone and parsing of the data to give complete response of a transaction response time. But on load it will give the correct statistics , So nvever consider the Vugen as the standard tool, but the response times given by Performance center or Controller will give exact response times of the transaction even for 1 user need to check there itself. (Vuegn is just checking script pass or fail).