Please, take a look at the Reporter FAQ here. In particular the entry Why is my report so slow.
Did you look at the execution time of the data provider? You will have to separate this time from the computation time, this is the time that it takes Business Objects to actually render the data on your screen after the data has been retrieved from the database. The computation time includes calculating of all variables, formulas, filters, alerters, applying formatting, etc.
Andreas 
(BOB member since 2002-06-20)