It’s especially the line menu. My current game has about 150 lines and becomes unplayable with the line menu on. Even if I switch to “visible lines only”, this has no effect to make things better. As this even happens if you scroll to an area where ther are no lines at all visible, the game stalls. So my guess is that it’s not a graphics memory issue but a generell issue with the game code doing a gazillion calculations with those 150 lines in the background once the line menu is visible, which then stalls the game.