Comment 1 for bug 607050

I've seen this as well. As I understand it there is little we can do immediately because the duplicate matching logic causes very complex queries that are executed poorly by postgresql. We're looking into our overall search needs at the moment, with a goal of refreshing the low level search implementation - and thus fixing the root cause of bugs like this.

However we may be able to tweak this a little in the short term - we'll see what we can do.