How to run aspx.cs page load event parallel from asp.net mvc functionality

I'm working on a project which is built in asp.net MVC and is using an aspx/aspx.cs page in order to implement ReportViewer Control. But the thing happening is when i try to view the report the other functionality seems to be on hold until the page is loaded completely. So i'm thinking how can i run it parallel to my asp.net mvc functionality so that both works synchronously. Do i need to use multi-threading here? Please help i'm stuck here.