I vaguely recall using the L/R scroll to intentionally alter event timing, and needing to be aware of viewport variations from my usual run as I got faster, to

I vaguely recall using the L/R scroll to intentionally alter event timing, and needing to be aware of viewport variations from my usual run as I got faster, to avoid something being in the wrong place. But it has been many years now since I last played. I don’t recall SMW having much that needed to trigger in any particular order or speed, outside of the autoscroll levels. But since some levels already have too many sprites to keep up performance, I don’t think they would have been as worried about time precision as much as stopping extra work as soon as objects are hidden off-screen.