Alternative of Reportsource in CrystalReport to avoid longtime processing

Question

Hello ,
Why   crystalreportViewer.ReportSource = objReport line takes too much time for huge data ?
Even it take long time sometime for little data .
I wait for more than hour but it is not displaying data.

Is there any other option which can exclude this statement ?

My Query takes few seconds so there is no issue of SQL optimization.

But when we check with debugging , it takes long time to display report even all lines executes in coding.

Plz help me .
Thanks in Advance

Regards,
Yogesh