I had the same issue. Turned out to be indexing sucking up system resources. If you still have the issue I would recommend shutting it down as you don't need it constantly updating in the background.
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DID, no cheats, no shortcuts, no non-historic equipment deviations. Boat and crew safety is integral with my immersion style! Follow the historic events during your patrol:
http://www.uboat.net/today.html