When I say this: > especially if the project has many files to load at runtime for interpretation. I bet it's spending a lot of time on require(). I am talkin

When I say this: > especially if the project has many files to load at runtime for interpretation. I bet it's spending a lot of time on require(). I am talking about tsc itself. If there are hundreds/thousands of modules to load, node will spend time on that. coffeescript is a much smaller transpiler, with just a handful of source files. EDIT - looks like tsc might get distributed as a single file, which helps here. However, it is a 7mb source file :) https://raw.githubusercontent.com/microsoft/TypeScript/main/lib/typescript.js https://raw.githubusercontent.com/microsoft/TypeScript/main/... When I execute it locally, with no arguments, it finishes instantly as far as I can tell. So maybe tsc itself is indeed super slow for just an empty file.