Yup, and early TeX did it too. You could run a memory dump of a previously initialized version to improve start-up times. For a modern take on similar idea see

Yup, and early TeX did it too. You could run a memory dump of a previously initialized version to improve start-up times. For a modern take on similar idea see also this discussion from a while ago: "Improving startup time in Atom with V8 snapshots" https://news.ycombinator.com/item?id=14140421 https://news.ycombinator.com/item?id=14140421