Mouse jumpy and nonresponsive when using hotel wi fi

Registration date
Friday June 7, 2013
Last seen
June 7, 2013
my laptop was working just fine at home with our router, and has worked at coffee shops, etc., just fine. Here at the hotel tonight (and I remember another time at my sister's house), when I boot it up, the mouse is jumpy and nonresponsive, as if the computer is too busy processing/searching for/doing something else, and can't react to my finger on the mouse pad. I disconnected the internet connection, and the mouse performed much better. what's going on?