Optimize gridview binding in ASP.net

Question

Hi all, I am creating a web application in that on home page there is 7-8 gridviews. These all gridviews are binded on pageLoad method/event of the main page.

Each grid view has different query or a procedure for binding. When i am running a project it can take 40-45 sec to load the page. I want to optimize this as like it will load in minimum time. Is there any way to optimize the page or site.