I'd imagine the game's pretty hard on the GPU regardless of what Google says. Given the number of shaders and filters in use (which matches with Elade's recent experience) strongly suggests such. I'm not sure when they last pushed updates out to the client, but that could possibly be a problem?
One thing you might want to try which may or may not work with the current launcher is to do something like this:
1) Right-click the GW2 shortcut.
2) Modify the path to the launcher (Gw2.exe by default) by tacking on
-dx9single so it reads something like
C:\Program Files\Guild Wars 2\Gw2.exe -dx9single3) Click OK and try launching it again.
Or, if you're into the whole command prompt thing, you can do it the slightly harder way:
1) Open a command prompt.
2) Navigate to the GW2 directory (probably
cd "C:\Program Files\Guild Wars 2\" on 32-bit Windows or
cd "C:\Program Files (x86)\Guild Wars 2\" on 64-bit... I might be wrong since I never install games to Program Files and thus can't remember
)
3) Then run the launcher by hand with the command:
Gw2.exe -dx9singleThat's one option that WINE users have to improve performance (though it doesn't always work), but it may also help in your case. Otherwise, post your wife's computer specs and maybe we can put our heads together to figure out a workaround since it's very probably from a recent patch that broke support for that hardware.