I have been testing with the problem in my previous post,  reset_rc_styles_recurse being very slow. I made a small test case that adds 201.000 items to the view.  Thousand items with one header item. When I detach gtk_container_remove(), then gtk_container_add() again, it the add takes: clearlooks: 9.3 seconds aurora: 9.2 seconds ambiance: 15.5 seconds cleanice: read more »