DeltaList very inefficient for large projects

[gsmet]

Affected version

3.14.0

Bug description

I'm experimenting with a large Quarkus project to try to enhance our build time and I noticed that DeltaList was very inefficient on this very large project.

It takes several seconds to figure out that nothing has changed when I compile the project again.

Here is a profile:

As you can see, it represents close to 4% of the whole build (and the whole build is several dozens of seconds).

I'm experimenting with a patch.