Thanks everyone! Here's my game link, and I'm also working on an English version right now! →
https://lalpha-lara.itch.io/gense
I’m struggling to put this "lag" into words, but I did notice something: all the normal scene changes are totally smooth, but as soon as a VN-style popup shows up, the game starts to stutter. I’ll definitely take your tips and update Decker to the newest version to see if that helps. It’s probably just my huge number of cards being a problem lol