All I know is that I’ve been playing GW2 since my birthday (June 8th) of this year and had no FPS issues until last week suddenly. I was in an invasion, game crashed my PC. Rebooted PC & game. Non-stop horrid FPS that drops between 10-4 from then on. My browser was also effected making Youtube suddenly impossible to watch. This leads me to believe that it’s not my system. I tried a couple fixes with no results.
Because of this, I’m sadly forced to postpone playing until there’s some solution.