LOL, Thanks for the feedback.I'm not sure if you mean overall game lag or the amount of time it take for the ball to "fall".
If it's game lag I've uploaded a free .exe version of the game, it runs reasonably well on my Windows VM so I'm assuming it might be a better option if you still want to try the game.
Long story short this is my first game made in Godot and I'm only now finding out about the severe limitations of its native physics engine.