[oivey]

Working in a nonlinear manner is the whole point of Pluto. You can modify some intermediate processing in the script and none of the upstream cells, like loading the data, will run again. I also don’t need to fish through the whole damn notebook to run all the cells my change impacts. If you really, really don’t want downstream stuff to run you can either do some of the button tricks the other comments mentioned or copy (a subset) of the data. Usually I find I want to see the results of my change on everything downstream, though.