When opening the file in the 3.5beta2 version of Kubuntu 12.04 alpha 1, the unmodified file opens very quick again.
I marked the bug as resolved In freedesktop.org Bugzilla #42684.
Herewith I would like to thank everyone involved in solving this issue.
It was a file I use to keep details of about everything in my household, so I needed it rather often,
and I am very happy I don't need to revert to an old Kubuntu version to keep using it.
When opening the file in the 3.5beta2 version of Kubuntu 12.04 alpha 1, the unmodified file opens very quick again.
I marked the bug as resolved In freedesktop.org Bugzilla #42684.
Herewith I would like to thank everyone involved in solving this issue.
It was a file I use to keep details of about everything in my household, so I needed it rather often,
and I am very happy I don't need to revert to an old Kubuntu version to keep using it.
Best rgds,
Marc