did you find the root cause of why production server take more than 5 minutes and the reporting server take less than 1? caused by CPU contention? or the "read uncommit" solved the locking issue? if it's the later one, then the performance issue can be solved by transation level turn on "read uncommit".

sometime report just take too long by joining tables, when table grow, the cardition join will get worse and worse, have to think about de-normalization and BI/OLAP solution at that point.

just a thought.

jiulu