I know that the EV3 system is not made for CPU intensive work. Nevertheless, this might be interesting for some programs, and I could do this without disturbing the physical setup of my son. My first program was a simple Mandelbrot computation, and part of my motivation to do this was because this turned out to be much slower than I thought it should be. First of all, the EV3 is not slow. You are likely to see any delay in computations only when you do thousands or more operations in quick succession. The Mandelbrot program fills the screen pixel by pixel, and does up to 10 iterations for each of them, which is why you can actually see the delay in computation. My initial version filled the screen in something like 5 minutes, and I suspected I could do better. It turned out I was right, but the biggest boost came from changing an unsuspected part of the program. ...