I am not sure if this is a problem or just how PE works. When I download all maps of cities I have visited or may visit in the futures (which amounts to 50+), PE becomes slow to respond, especially when I try to move different destinations into Groups. It could take 20 mins or becomes frozen when I try to move 20 destinations into one group.
So the best way to use PE is to download just enough maps for the trip instead of download as much map as desired for future reference? And I have to erase maps used for the trip in order to make room for maps for the next trip?