A blank canvas can be compressed down to one thing for the computer to remember and output later. If a black ball moved across the white background, it could still remember most of the white from before, but some of it would have to change to black. Now do that thousands of times with dozens of different colors. It’s a lot of rapidly changing information all at once. The computer can’t rely on remembering shortcuts, so it has to put in a lot of hard work to actually output the video.
Tom Scott has a great video explaining and demonstrating this: https://youtu.be/r6Rp-uo6HmI
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