Earlier quoted context omitted.
With a lot of files app startup can be delayed and the event loop be blocked. Which messes with timeouts among other things. The problem is that each file is loaded from disk and parsed in series without any level of parallelism (no real way around that in a pre-ES6 world). With CoffeeScript you put the time it takes to compile to JavaScript on top of that. If you have a big app with a lot of CoffeeScript files, it m…
I don't see that being an issue for the vast majority of Node.js programs, i.e. long-running servers.
will it impede functionality? probably not. will it add precious time to server process start time? definitely, especially if the problem gets compounded.