Hi traumatiziert,

If your tracked changes include images, tables, textboxes, cross-references, etc, Word can devour a lot of time just managing all the overhead. Track only the things that need to be tracked. For example, if you're just dragging content from one place to another, ask yourself whether all of what's being moved needs to be tracked. Sometimes, too, the amount of data to be tracked through such changes can be minimized by choosing to move the data that represents the least number of bytes (images consume a lot).

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]