There has been some optimizations on the latest GTK+ versions: http://mail.gnome.org/archives/gnome-announce-list/2005-October/msg00013.html http://mail.gnome.org/archives/gnome-announce-list/2005-October/msg00015.html But until the latest GTK+ version is uploaded to Debian you won't see any speedup.
Prueba el Nuevo Correo Terra; Seguro, R�pido, Fiable.