Remember to use the corresponding DVD navigator filters. Its know issue that mixing mpeg2 decoders and different DVD navigators cause issues.I have the same issue.. its awfull with MPA/MPV but a little better with NvidiaAdd another 'me too' post.
The last two SVNs are giving me slow (if any) navigation on the DVD menus.
I'll test an older SVN later this evening when I have some free time.
using the 19376 SVN