Hi folks--
As we mentioned in yesterday's update, we've just pushed a new patch to the demo that comes with a toggle for the game's animations. If you've been having trouble with your framerate, you can flip this toggle at any point in the game's preferences. (Accessed via main menu or by hitting escape)
Turning off animations should allow the demo to run well on most machines!
Thank you so much for your patience while we got this sorted, and we hope you continue to enjoy the game!