[yashap]

What are the last Scala/sbt versions you’ve used? Scala compilation times (and sbt startup times) have improved dramatically over time, it’s reasonably fast now. In the past 3 years, the Scala compiler has gotten literally twice as fast. I don’t have hard numbers for sbt, but it feels like it has improved by much more than that.

For a mid-sized web service (tens of thousands of LOC), a clean compile might take ~30-40 seconds, but you rarely do those. Incremental compiles take more like single-digit seconds, and for most projects you can have a solid “compile on save” type setup that makes it pretty unnoticeable. And sbt itself, which used to be very slow to startup (sometimes 10-20 seconds), now starts up in a couple seconds.

It’s not lightning fast like Go, but it’s way faster than it used to be. Not much of a pain point anymore unless you’re dealing with truly huge projects.