The main issue with running STK on an emulator such as Parallels or CrossOver is that the emulator will not be able to take full advantage of the graphics card installed on the workstation. Typically the graphics settings in the emulator environment defaults to a lower version of the OpenGL setting available for the windows OS in the emulator configuration. Certain actions such as loading high-resolution imagery, terrain, or 3D models (with high pixel counts or large amounts of 3D models) into the STK application will require system with significant memory and processing power. Also make sure the graphics card driver is up to date. See STK System Requirements.