https://www.youtube.com/watch?v=1dcrV_7JpXQ
Pouet link if you want the binary: https://www.pouet.net/prod.php?which=1221
It blew my mind when I first came across it in 2003, and it's still highly impressive even now.
For whatever reason I became obsessed with this lesser known demo called g-cube and watched it a lot in 2011.
Just wanted to share(anyone remember it?): https://www.youtube.com/watch?v=fc0gh5wnItw
That path brought me to HPC, efficient and high performance programming and showed me how thinking about writing efficient code made a difference.
Yes, you can't arrive to demoscene level wizardy in every application/tool you write, but optimizing the obvious and then some changes things a lot.
Thinking about it again, possibly coming from C64 and early x86 hardware already primed me to "do more with less" mindset already, but '.the .product' get the things rolling.