Is it just me or 'Duke Nukem Forever Demo' for PC is really slow?

It might be your computer. I literally just downloaded the demo about an hour ago and I get 60+ frames per second on my gaming laptop. If you have a steam then I am sure that you are a gamer and have sufficient components and probably surpass the recommended system requirements. There may be an error is the graphics coding or something like that. I'm not even sure graphics coding is even a real term. I know its something like that. Try uninstalling and reinstalling it.