New answers tagged debugging
I had the same problem with Ubuntu 14.10. The problem was solved when I upgraded Ubuntu to 15.04. BTW "Adobe Brackets" is also gets normal from "very slow".
To answer my own question: I had to build GTK 2 with the --enable-debug flag (-dbg packages only add symbols to debug the library itself) and preload the built GDK library. Steps: apt-get source gtk+2.0 enter the created gtk+2.0 directory in the "rules" file in the debian directory, add --enable-debug=yes to the configure_flags dpkg-buildpackage -us -uc ...
It is not quite easy to do if you do not know how to build kernels. First of all you install all kernel releases one by one and find out on which release the problem appears. It is not too hard. But then you look at kernel related commits between these releases and look for a specific commit, which causes the issue. This part is the hardest one.
By reading man 5 core I have found what happens when a program crash. By setting core_pattern, I can launch something else than apport that fork-setuid-setgit-exec zenity.
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