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for a very large graphql api maybe? I've seen long compiles with a combo of Absinthe, Phoenix, and Elm. Also if you are not a little careful about dependency cycles it can get messy. It is an easy thing to check in CI via mix xref graph --format cycles --fail-above

Ah yeah great callout, that's very plausible. We used Absinthe heavily to power our GraphQL API.

Not remotely. Maybe I'm just not working on big enough projects, but I've never experienced any frustration at all with Elixir compile times.

Nope. I also worked on a Startup with a Full Phoenix LiveView Experience. Codebase was around 300k-400k lines of code and compilation was blazing fast. I would say they have a lot of circular dependencies if they are experiencing that.