Im pretty sure ive been stung by OO.org bug #94033 or #101398 and it hurts. Both describe a significant time delay when opening certain document files with controls. I can reproduce the delay on Microsoft Word documents that include embedded objects.

Hopefully upgrading to OO.org 3.1 following this tutorial resolves the issue. Another suggestion is to downgrade to OO.org 2.41.

Until then, its abiword and friends.