Question - I get perfect FPS, but as soon as I change zones maybe once or twice my FPS almost everywhere goes to less than 30 - often 15-25.
I have to reload the game every 20 minutes so my FPS resets, it looks like a memory leak but memory is fairly stable between 1.5-2GB and rarely uses more.

I have updated my graphics drivers; and don't have this issue in other games.
Is this a known issue?
I have:

AMD FX9590
R9 290x
DDR3 mobo
Corsair SSD at 6GB/s
etc etc.

It's literally just memory leaks. Go to options and turn down your rendering and it'll help a bit for the FPS drops. But you'll still need to relog every once in a while if you get texture glitches or your client will crash. Nothing you can do about it, it's been an issue for a long time.

I'm fairly certain every time an item spawns but you don't pick it up it causes a memory leak. Supposedly CS fixed the memory leaks but obviously not. c: