I'm stuck using an old P3 550mhz, and the Ghost Demo and Spaceship with 3d rotation work fine as stand alones, but the ghost game crashes out when I try to run it from Construct. And if I make a frame with just a sprite and try to run it, it does the same thing. Santa Smile does it in the stand alone.
I'm using a GeForce 3 Ti, 256 megs of RAM.
Overall, I'm glad I discovered Construct though and look forward to using it since I'm already an MMF expert I'm in love with it! Sweet App!!