Larian Studios Forums Divinity - Original Sin Divinity - Original Sin - Technical Issues Why does this game stutter so much @ 4K?

I checked memory usage for this game when it runs @ 4K. It doesn't even use up 2GB of VRAM! Which brings me to the question - why on Earth is it running at below 60fps on my machine? AFAIK my machine is fast enough for this game to play @ 60fps @ 4K, is it not???