The problem seems to be within 
wine. I messured 43 seconds to load the map in nx0.4 and 98 seconds in nx0.5. 
No matter if its a harddisk installation or running from usb. After updateing 
wine to version 1.6 the map loads faster... it takes 38 seconds now. 
And i have no problems with moving the map. Here is how to update 
wine to the latest version using a harddisk installation:
Open a Terminal (can be done by pressing ctrl+alt+t at the same time) then copy and paste the follwing lines.
Code:
sudo add-apt-repository ppa:ubuntu-wine/ppa
sudo apt-get update
sudo apt-get -y install wine
 There will be a new ISO download soon, with the new 
wine integrated and a couple of other fixes and updates.