> the app begins to significantly slow down due to the need to redraw every stroke continually. Why the continually? If the screen shows the result of drawing

> the app begins to significantly slow down due to the need to redraw every stroke continually. Why the continually? If the screen shows the result of drawing all strokes, and the user draws a new one, you only need to draw that new one. If redrawing gets slow, I would save both the strokes and their current rendering and, on redraw, just blit the rendering. Also, in case you haven’t seen them: https://developer.apple.com/documentation/pencilkit https://developer.apple.com/documentation/pencilkit or the example code at https://developer.apple.com/documentation/pencilkit/drawing_with_pencilkit https://developer.apple.com/documentation/pencilkit/drawing_....