Thanks for the comment!
I didn't notice any lag on my machine even 40-50 turns in, but there are definitely a lot of things that are coded very haphazardly due to the time constraints so hopefully I'll be able to iron out any performance issues later on. And the dragging is definitely my main problem too. It gets super tedious when you start producing a dozen or so new items every turn. I'm thinking of ways I could allow the player to automate the process, with some sort of stockpile mechanic.
Overall I appreciate the thorough feedback! I'm excited to start ironing some of this stuff out after the jam.