astroflux devs stopped working on the game, they dont feel the need to optimize it i guess. i have a 2011 macbook air, the worst model. i can play without lag sometimes, wifi seems to matter the most. it could use a lot of optimizations tho
you have to actually create an account to save, and then u have to log back in. the log in thing is kinda hidden, but just click at the bottom of the screen when it is letting you log on as a guest