Guild Wars 2

Hi, yesterday I finished for the first time the map, and this morning I saw that the game was laggy and the mouse movement had a big delay.
I tried to repair the client,but nothing. Now I’m downloading the game again, and I hope that the game will have no same problem.

Some advice?
(sorry for bad english)

Same problem for me, at the moment I’m doing 5-10 fps(Lions Arch map), but normally I do 30-50 fps.
My specs are: i5 3570k, 7970 ghz edition and 8gb ram