Yeah, I've gotten this exact comment so many times over the years lol.
Unfortunately, currently there aren't any plans to do a performance update. The performance issues come from more deep-seeded and complex issues because I made it back when I didn't really know how to properly code and stuff. Disabling shadows and bloom would make basically no difference. Actually, you would probably see the most performance increase from a simplification of the display screens and other random things. In the future perhaps, but not soon, since I would most likely be reworking everything. Maybe try running the game with your monitor's resolution a little smaller for now, I guess?