Guild Wars 2

Whenever I first open up the client to login, I can notice a 1-2 second delay on the interface for all of my other windows/computer. For instance, just scrolling my mouse over icons, it takes a little bit for them to highlight. I have also noticed that sometimes when I am downloading a patch, my screen crashes and I receive the video card has stopped responding and has successfully recovered message. I also have a very low framerate in game, and thought these two things might be connected. I don’t have any problems running any other program. I have also tried repairing my GW2 client, but it has not worked so far. Any help would be appreciated.

Also, the lag only occurs at the login client, once the full game is up, the rest of the computer is fine.