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Every time a new Rust version comes out I compile my toy Gtk-rs application ported from a C/C++ User Journal article about Gtkmm.

The C++ version still wins by several minutes on a Asus 1215B.

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Has the gap at least narrowed over time?

Definitely, the improvements on rustc are visible, so eventually it will reach there.

And I test it on that hardware on purpose, because I should not have to buy a top class desktop to achieve usable compile times similar to other AOT compiled languages.

However, I also admit that what is missing is having a backend that favours debug workflows, which do exist just aren't yet there.

Is this a fresh compile each time?

Yes, make clean all, cargo clean build.

If it does compile, could you try reporting results for multiple Rust compiles (e.g. the current one, and the ones from 6,12,18,24 months ago) ? (If you can, maybe do the same for C, but I don't know how easy that is).

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