Not as fast as Go, but straight compilation is about ~3x faster than 2015, with many improvements around incrementality and IDE speed that make things a lot better. Compilation still isn't "as fast as Go", but has probably approached "acceptable" now in 2021.
As one data point, "slow Scala compiles" was the #1 biggest developer complaint at my company when I joined in 2017, and nowadays that complaint doesn't even break the top 10. Scala compiles are not great, but not terrible.
A lot about Scala sucked in 2015, and I wouldn't recommend 2015 Scala to anyone, but it's not 2015 any more. 2021 Scala is what I'm talking about
As one data point, "slow Scala compiles" was the #1 biggest developer complaint at my company when I joined in 2017, and nowadays that complaint doesn't even break the top 10. Scala compiles are not great, but not terrible.
A lot about Scala sucked in 2015, and I wouldn't recommend 2015 Scala to anyone, but it's not 2015 any more. 2021 Scala is what I'm talking about