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The actual compilation step is 100% not the bottleneck - it can go as fast as 10k-50k lines per second! (According to the Mill benchmark, but that’s the Mill-independent part).

Comparatively, Go does “only” 16k lines per second based on some HN comments.

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But you’re likely comparing on different hardware though. Go compiling only 16k lines per second is hard to believe for me. Maybe they meant on single CPU core. Rustc compiles over 50k lines per second on my MBP in debug mode and Go must be definitely faster, as everyone knows rust is very slow to compile.

But anyway, you may be right. I just ran mvn install for the second time with no source change on my current project. It took 57 seconds.

The java metric is also from a single core. But you are probably right that it should only be taken as a rough ballpark, but java is definitely in the same ballpark as go in compile speed.

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