Yeah, it’s really fast. In fact before I joined, I also set up a default CodeSpaces environment for my own repo and then I was up and running in only a few minutes, and that was the first time so I was learning and reading the docs. I could then set up all subsequent new CodeSpaces to start in seconds.

But yes, once a project commits to using CodeSpaces dev environment (even and especially ones with large code / heavyweight environments) there is a lot that can be done to optimise the spawn up time, that cannot be done as easily for local dev.