I have the same thing til yesterday i could run 60 FPS in the cities and 45 during boss fights and most of the time in wvw with a few drops to 20 when to many show up. Now sitting in Lions Arch 15-20 fps and boss fights are single digits have not tried wvw yet. Ive tried repairing and reloading the game same thing
win10, x5650 4ghz, 12gb, 780 and run at 1920×1200 mostly max but the ground setting and shadows