Hi, Gary, you may have noticed that I've started to port the 'multi_processor' branch to the 1.3 line (via the 'multi_processor_merge' branch). This porting is very messy and will need to be significantly cleaned up at the end - long after all the porting has taken place. The new design is so radically different that the code is horribly broken at the moment. But I should be able to fix most things. There is one part that I can't fix though, and that is the parallelisation of the grid search. The problem is that this code is no longer in relax. It has all been shifted to the minfx project (https://gna.org/projects/minfx/), a library of optimisation algorithms. I'll skip this code for now, but it might be worth discussing the options for having a parallelised grid search in the 1.3 line. Do you have any ideas how this could be done now that the code spans two completely different projects? Cheers, Edward