Hi Preetham Reddy,
What is the workflow to reproduce the issue? If your credentials are failing, please make sure that you can login in the official Google Analytics page
I just created a new Sitefinity 4.1 installation and used the data for Telerik.com to check whether the product will load OK with such huge quantity of information, and it is performing pretty well.
Thank you for contacting us, we look forward to resolving your problem in a timely manner.
the Telerik team