supernestor {l Wrote}:Why would the game be so slower ?
Because it has to load a lot more resources. You don't have to worry if your computer is usually fast.
supernestor {l Wrote}:Could you tell me where are located addons on my computer, so I can copy/paste on another computer and keep the same addons ?
Sure
Copy the following "Addons" folder, from following location to the same location on your second computer.
On Windows: It is in %APPDATA%/supertuxkart/ (you can enter that in the Explorer and it will take you there)
On Linux: Either in $XDG_CONFIG_HOME/supertuxkart/ (first choice), ~/.config/supertuxkart/ (second choice) or in ~/.supertuxkart/ (third choice).
On Mac OS X: It is in ~/Library/Application Support/supertuxkart/. Note that this directory may be hidden.