I think there is a problem with bags of holding in general(scroll case, ammo belts, bags ecc ecc). I don't know if it's only me but it seems like, for some reason, Sandrah makes the game stutter when i have any kind of bag of holding in the inventory. Maybe because the inventory is continuously checked and there is some problem in doing it when things are in the bags? I know it's a problem that's also found in another kind of mods that make the game continuously check the inventory in search for some items.
I know it's this mod because the stutter ended when i CTRL+Y Sandrah
Not a great problem since i also have installed the mule, i just hope the mod will not check it too for items, gonna try that later