Flicker in accordion

Flicker in accordion


I noticed an annoying flicker on the accordion widget, using ths all-
in-one UI Bundle:
<script type="text/javascript" src="lib/js/jquery-
ui-1.7.2.custom.min.js"></script>
The flicker can be noticed when changing the Tabs. It seems for a
millisec. all tab are displayed. The animation looks very jerky in ALL
browsers.
when I run the demos with the development bundle
<script type="text/javascript" src="development-bundle/ui/
ui.core.js"></script>
<script type="text/javascript" src="development-bundle/ui/
ui.accordion.js"></script>
the flicker is gone and the animation is smooth. Really strange!
Any explanation?