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We have a 100k LoC project that builds in 15 seconds in maven and that includes packaging everything into an Uber jar.

Do you have a fast SSD? It makes an enormous difference in build times

I have an old Western Digital Blue hard drive. My setup is really old. It is about >5 years old.

That's why your builds are slow I guarantee it. Our build times dropped from ~4 minutes to ~20 seconds when they got everyone machines with SSD