If you are experiencing slowness in scrolling while using the map window in Dream Maker, I have discovered a solution. Beware, it may or may not work for you, however it worked for me. Keep in mind that I am not responsible for any of your own actions.
Now that that is over with, here is what worked for me.
-Right click the desktop and select Properties.
-Go to the Settings tab, and click Advanced.
-Select the Troubleshoot tab.
-Move the slider back (left) one notch, and select Ok.
-Click Ok on the last window and you should be prompted.
-Respond Yes or Ok, and the monitor should flicker.
-When the monitor finishes, open up Dream Maker and try scrolling.
*To reverse the process (if it didn't work) just go back and move the slider to the right one notch.