Greetings.
So I just played through the demo, and it was nice. However there's something in the game that my laptop REALLY doesn't like. And it's not consistent in it's location, I've checked and it's not Matilda either. When I first encountered it in the tutorial it was in the reception room. However later in the night it worked perfectly fine. When I tried to to the first real chapter, it was by Cam 1 near the loading bay. On my succeful attempt at the chapter, I only encountered it momentarily on floor 2. I have my setting set to low and normally the game runs at a smooth 60 in that regard, except for this one mystery object. I haven't a clue what in oblivion it is, so I'm reporting here. Once again, I can confirm it's not the lizard.
Stay Well