I do understand what you are saying about the more logic - the longer it takes.  I have found experiemetnally some things that take a long time.  In report paramteres - if you check allow null values it adds a lot of time to the report.  I haven't a clue as to why.   Have you found anything that has a good list of do's and don'ts for RS? 

The two of the things that bother me most I guess is that very small reports without much formatting still take a long time ( longer thatn users are willing and should have to wait -- 1-2 seconds) and that after the report has finally rendered if the user does a next page or expands a collapsed region (that may have 20 detail lines in it) it takes multiple seconds.  This should be instantaneous once the report is displayed the first time. 

What is it actually doing when you expand a region or next page?  If I knew that maybe I could track down the slowness if it's something on my end or that I coudl affect.