Thanks @despair for the advice. I will continue to use PRT and gradually build up MATLAB. I have some previous experience using Matlab but relatively basic, so it would be a long and difficult journey but if the end result is more control and faster testing then it should be worth it. In the meantime, I am trying to speed up backtesting in PRT. I have seen other topics on prorealcode about RAM and decimal points and glitches with position size, so I’ll work through all these topics to see if I can improve speed. It takes so long to backtest that I am wasting a lot of time