How far? Real-time zooming on Mandelbrot was already done 20 years ago. Sure it was using a "trick" in that at each frame only a few vertical and horizontal l

How far? Real-time zooming on Mandelbrot was already done 20 years ago. Sure it was using a "trick" in that at each frame only a few vertical and horizontal lines were recomputed, and the others simply re-used from the previous frame but still... (and at every frame each line was guaranteed to be "at most" x frames old). It looked really nice and it was cool to see a real-time zoom on a Mandelbrot... In the nineties! It was going for quite a while too...