The key enabling technology that makes Rewind possible is Apple Silicon [0]. We utilize virtually every part of the System on a Chip (SoC) so that running Rewind doesn’t tax system resources (like CPU and memory) while it is recording. It feels virtually imperceptible.
I would love a better understanding of this… while I have a an appreciation for metal and the frameworks offered I’m confused how low level you can go when A-Linux had such issues getting going - abs further, the API’s natively available could actually be private? (Which would make sense why it would only work on Mac and not iOS as bypassing the App Store as possible)
[0] https://www.apple.com/newsroom/2020/11/apple-unleashes-m1/