I've been having client crashes and rendering issues since past 3 days. I have no idea why it happens now, but anyway, I never had any fps issue.
Client crash usually happens when I'm running away in RvR. Game close by itself and a bug report pop up, with 2 buttons, but there isn't any texts anywhere in the bug report's window.
As for rendering issues, it doesn't happen as often as my crashes. I'm not sure how to explain it, a video would be easier, if I manage to catch it. I'd use my mount, my name/hp/mp bars would stay at the location I used my mount, I could move around, but nothing would render(I can't even see my own character/mount. Or I'd run into a zerg of Diones, but I've had issues with mount mostly.