[pygtk] odd performance discrepancies between gtk.ListStore.insert() and gtk.ListStore.append()

[Jason Gerard DeRose]

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In my work on FUPlayer, I discovered an odd performance discrepancies
between gtk.ListStore.insert() and gtk.ListStore.append(), namely that
insert() is significantly faster than append().

In my benchmarks, run under Ubuntu Breezy (pygtk 2.8.1, gtk 2.8.6),
populating a ListStore using insert() ran in 77% the time of append().
To me this suggests a bug in pygtk or gtk.

I have attached small script demonstrating this.

Cheers!
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