Repetitive Formatting of Reports

[Tracy]

Why is it that, at the time of running a report it formats every single page in the report, and then once it's displayed on the screen, and I scroll to the next page on screen, it goes through the same code to format the next section on the next page? My report is so complex and detailed, that it is already taking 3 minutes to run, but then when I want to scroll to subsequent pages it takes another 3 minutes to do so.

Thanks