If it were your graphics card that was causing issues, I doubt I could even *run* the game, which I had no issues with. Your card is literally 5x better than mine.
My card lacks sufficient memory to render large scenes and is very slow. Rendering the images and displaying them work differently. With the game you're just looking at a jpg. When it's rendering, it's loading everything in the scene into memory to create the image and with the limited memory of my card... I hit the cap very quickly.