Wildstar requires a really good PC, a video card with 1 GB RAM is not enough.
The only option that is killing the game’s performace is “Render Target Scale”. If this option is not set to minimum (0.5), you will get very low framerate.
For example, on my system, Intel I3 3GHz, 8 gigabytes RAM, ATI Radeon HD 5670 (1 GB RAM), I get 20-40 FPS on 0.5 Render Target Scale and around 10-20 FPS if Render Target Scale is set to 0.75. With 10-20 FPS, the game is almost unplayable.
The other video options are not affecting the game’s performance almost at all.
If you want to play the game, a video card with at least 2+ GB RAM is required.
How is the game working out for you?