I'm really inspired by demoscene (read more: https://www.reddit.com/r/Demoscene/, https://en.wikipedia.org/wiki/Demoscene), which strives for the smallest possible self-contained that can create an audio-visual scene. 'Demos' often use intentionally confined or antiquated hardware to flex their artistic and programming skills. It's a predominately European phenomenon, mixing programmers, musicians, and graphic designers. The lightweight programs are designed to render in real-time in high-resolution (those videos are captured from being rendered in real-time), so the optimization involved is breathtaking.