This isn't really a system issue so much as a curiosity.

I was doing the "Exarch's Call" questline, where you have to do the trials for Yrel. After doing them, I had to meet the others south of Karabor. After landing, and heading through the gardens, my FPS tanked to about ~20 and I got ridiculous stuttering. I thought there was something wrong with my system, so I reloaded wow, shut off addons, reloaded chrome, etc.

Interestingly, the FPS goes back to normal (solid 60) in the actual ampitheater. And moving north to the steps of Karabor also fixes it. But if I step into the gardens between them, FPS goes to shit, no matter which way the camera is facing.

Any thoughts?