Controlling execution of subreport on main Report in ssrs 2008 R2

Controlling execution of subreport on main Report in ssrs

Hi,

Am using more than 100 subreports in my main report using ssrs 2008 R2.

And given conditional Visibility in sub reports based on the Parameter selection in main Report . But the performance is very very slow in main report.

While selecting single sub report executes in seconds. The same report in main report executes in hours.

According to my view,

All the Sub reports executes and finally conditional visibility is working. Can we Control executing sub reports?