Problem while SSRS reporting

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SSRS

Hi....

I am trying to display table in ssrs report depending on particular condition.I have declare two dataset.one gives data depends upon one condition and other gives data on diff condition.I have taken two tables.For my report i am set visibility of tables depending upon condition same used for dataset.dataset1 for first table and dataset2 for second table.In my report i have found that report generating very slow in 2nd condn.I have check in sql query ,query gives me fast result but report not generate fast.Can you tell me why this happen provide a solution.thanx