Sorry for the late reply, my PC is pretty well off in the RAM department (not in the hardcore levels, but still good), so I don't have too many issues with art programs on it. Because of that I can't 100% confirm this for certain but I believe that clip studio paint treats the storyboard as thumbnails, as in they're not all open at the same time (and if you double click them you will open them) so they should not lag you. If you double click and open them all at once though then yeah, you're computer will probably start to hate you.