Assuming that you're talking about the 21.5 inch iMac with an i3 processor, it only has 256MB of VRAM, and that's relatively low. I'm sure it'll work, but I don't know how well. With that said, let it be known now that I have NOT tested this aircraft on a 256MB video card, so I cannot vouch as to its performance. For any of you interested... I have tested the CRJ on a more modest computer with the following specs: Intel Dual Core E6850 3.0 GHZ 8GB (X-Plane uses only up to 3GB) ram AMD Radeon 5870 1GB ram The above setup, sans the video card, is 3.5 years old. With the above setup on extreme resolution I am getting about 33-35 fps. With regards to laptops...there are some that I personally feel are suitable. Among those are the latest editions of the Macbook Pro with an i7 CPU and 1GB VRAM. Overall the actual CRJ itself is not overly taxing. It's the plug-in driven screens and systems that chew up most of the power. Philipp has ensured that no optimization for this plug-in has been left out, and with the multiple cores put to use it also helps. With all of this said, the real culprit here will be your CPU!