I decided the start playing a 0.16 Seablock save file. I downloaded the new seablock config modpack and a few extras. When I attempt to open the save file, the green progress bar over the menu screen completes, and then I'm given a macOS popup saying the game crashed. What's peculiar is that I have ...

I'm seeing serious performance issues with GUI responsiveness on macOS (relative to 0.16 stable; I didn't get a chance to try 0.17.0). Sometimes everything is smooth, but very often (several times a minute) the player character will continue walking after I release the key, or it will take several s...