Workaround for slow text preferences:
https://gitlab.gnome.org/GNOME/dia/-/merge_requests/133

Index: lib/dia-font-selector.c
--- lib/dia-font-selector.c.orig
+++ lib/dia-font-selector.c
@@ -496,7 +496,6 @@ dia_font_selector_init (DiaFontSelector *fs)
   gtk_cell_layout_pack_start (GTK_CELL_LAYOUT (priv->fonts), renderer, TRUE);
   gtk_cell_layout_set_attributes (GTK_CELL_LAYOUT (priv->fonts), renderer,
                                   "text", FONT_COL_FAMILY,
-                                  "family", FONT_COL_FAMILY,
                                   NULL);
 
   gtk_combo_box_set_row_separator_func (GTK_COMBO_BOX (priv->fonts),
