/usr/share/applications/gtkperf.desktop is in gtkperf 0.40+ds-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | [Desktop Entry]
Name=GtkPerf
Comment=Test GTK+ performance
Exec=gtkperf
Icon=duck
Terminal=false
Type=Application
Categories=System;
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