Full-pass Scala compilation is slow, true. It takes my codebases at work a couple of minutes to compile currently. But<p>1) sbt incremental compilation is basically immediate. This facilitates tight feedback loops for running tests and using the repl<p>2) Scala&#x27;s type system does so much more than fast-compiling languages (Go, Java, etc) that it&#x27;s definitely worth it. What you lose in compile-time, you gain in speed to a correct and sound solution.