So it seems to relate to the same issue like in your previous post. The KB
[FIX: Performance decreases after you move a large report to SQL Server 2008 R2 Reporting Services][1].
Maybe a trying a workaround mentioned in the BK > Optimize the pagination for the report> when you design the report.
Don't have R2 instance and time currently available to play with it. But if will have a little more time I will try to test it on R2 instance.
[1]: http://support.microsoft.com/kb/2506799/en-us
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