Yast on 10.2 very slow

My Yast on openSUSE 10.2 (X86-64) has become slower and slower. Now Yast needs about 5 Minutes to initialize when I click software management. It works constantly on the hard drive.
The message is “Parsing files …”.
I checked these files and they are not bigger than 5 MB.
I disabled all additional repositories but no change.
There is enought disk space available.
When I disable the refresh for all repositories it’s ok.
What can be the reason for this?

There were issues with the 10.2 package management. 10.3 was a great improvement, and 11.0 is even better (and very fast).

There were patches to 10.2, so make sure that you have the latest from the Updates repo. You could try upgrading the package management only from the 10.3 repository (being sure to add the 10.3 Updates as well) - I suspect however you will be required to upgrade a lot of dependencies as well, if it is even possible.