> This version is 30 days old.
Actually, org-mode 6.21b was released on Feb. 2, 2009.
But org-mode does change quickly. :)
> To do not create problems with my Ubuntu distribution it is a bit hard
> to try newer versions but I can try if this is
>
> I feel that there is something critical beyond an upgrade but I do not
> know how to find the core of the problem
>
> Other modes are not slow
You can always try out a new version of org-mode without changing
anything in your emacs installation. Simply download
(http://orgmode.org/org-6.29c.zip), unzip, byte-compile the files
(either from the command line or dired), and add the new directory to
your load path.
See this FAQ for more information:
http://orgmode.org/worg/org-faq.php#installing-org-without-make-tools
Best,
Matt