How many drawing sheets until poor SW performance

Using SW2009 SP2.0, I have dual quad core xenon processorsand a Nvidia Quadro FX 1700 with approved drivers and 3Gb memory. Iam wondering if anyone else strings together multiple drawingsheets from an assembly and has experienced poor performance after10 or so sheets. Poor performance in that when you select anythingit takes 5 to 15 seconds before you can drag or create dimensions,move views, etc. Once you can use the command everthing moves greatand then when you accept the location it again waits 5 to 15seconds before you can move on.
Any suggestions would be helpful.SolidworksDrawings And Detailing