I just experienced this problem, I’m fairly new to Guild Wars 2, while playing started to experience severe framedrops and performance.
My specs: i5 4460/ EVGA GTX 970/ 8gig Hyper X fury/ MSI B85 PC MATE/ SSD Crucial/ WD 1TB HDD.
Been playing multiple games in the past months that haven’t had issues, most recent being Battlefield Hardline. So this is a problematic thing because after about 3 hours of play, performance starts to drop and it becomes less enjoyable. Usually when the FPS drops below 40, the CPU is at 40%+ and ram usage is at 2GB.