@marcel @dlx lol. I have a similar problem - I've been working for a couple of months in my own 2D Graph solution, because Swift Charts did not support 'rolling / animating charts’ (until yesterday?) and, performance is better compared to the abysmal library that I was using before. But, I know there's a better way to handle all my x,y data for each "line" that I need to draw, and Googling "best data structure for graph" leads to loads of results... for Computer Science graphs that is.