Larian Studios Forums Divinity - Original Sin Divinity - Original Sin - Technical Issues Low FPS on high end hardware?

If you create a new profile and start a new game, do you have the same problem?

Have you tried lowering the graphics settings and resolution, or switching to Windowed or Fake Fullscreen display mode, to see if that would make a difference?

Did you do a clean install of the graphics drivers when you upgraded cards? See here or here, for example.