upcoming on the next release of Palmdle: we have guess filtering working, and the worst-case scenario list search is pretty negligible on a Visor Platinum: https://github.com/Lana-chan/palmdle/commit/5ca37998879bec945aafcae5867f7b1020e7d918
next planned improvement is stat tracking, which will be a much larger change
upcoming on the next version of Palmdle: not stat tracking yet, but now there's tracking for which letters you've already tried (and they also get hidden for sharing)