Hello! And thank you again for your initial comment which alerted me to some of the game's serious performance issues.
I just recently pushed an update for BITSHIFT OVERDRIVE which refactored a lot under the hood and should improve performance significantly on all systems. If you'd be interested in trying out the new version, I would love to know if you have a better experience with v1.1 or if there are still any issues. ◠‿◠