BB Storm2 9550/9520 :: Map Rendering Speed On Phone Is Poor?

While driving I like to use Google Map and Trapster to track my route, traffic and speed traps. As the apps track movement, I expected the maps to scroll smoothly. While occassionally I see a smooth transition, much of the time, there is a lengthy delay where a portion of the map is white, while it waits to draw the new area. Is this delay a result of the Storm 2 hardware, or is it associated with download/network speed as the device has to download a new map each time you travel to a new area? Sometimes it can take several minutes to redraw the new map-- so I'm thinking it may be related to network speed in different areas as you travel.