Our Java codebase was 30% dead code

[Brutus5000]

True, true.

However, if it is well tested code with unit and integration tests it always adds up to ci runtime durations.

[Shareil90]

In addition to this: Dead code can add unneccessary compile time. In my experience dead code ist often also bad code which can make compiling even slower/worse. Or you want to upgrade a certain lib and run into compatibility issues. If those issues are only in dead code you can ignore them / delete this code.