I kept having varying results with attempting to do asyncstorage reads as well as anything else before the previewstream loaded, they all made it slower to some varying degree. right now the only thing that happens before the previewstream is some dom code required to show the preview stream, and some filmstrip self initialisation which didnt have a large impact (although it may be worth looking at in a follow up)

Plus it doesnt make any difference to our code whether its loaded early or not, we still have to handle the cases where asyncstorage hasnt loaded before the ui is activated