Version 4 introduces a new feature called Turbo Simulator. It is for those long 3D surface milling programs where simulation in the standard view takes a lot of time. It is a bare-bones simulator without fancy things like machine models, shadows, materials, etc. Its only function is to simulate as fast as possible. The picture shows a simulation of a 19,000 blocks CNC program. It took under 3 seconds to run at max speed. If you only want to see the toolpaths, you can use the improved Fast Backplotting function.