I discovered this quite a while ago, and I'm not entirely sure if there will be a way for you to fix it. You know how when your Mac reaches low battery it switches graphics modes or something? When I tried playing Blockade with my computer in low battery mode, the game lagged a lot when switching screens. I haven't tried reproducing it, but I'll leave my laptop off the charger for a while to see if the glitch happens again, or if it was a one-time thing.
I discovered this quite a while ago, and I'm not entirely sure if there will be a way for you to fix it. You know how when your Mac reaches low battery it switches graphics modes or something? When I tried playing Blockade with my computer in low battery mode, the game lagged a lot when switching screens. I haven't tried reproducing it, but I'll leave my laptop off the charger for a while to see if the glitch happens again, or if it was a one-time thing.