ZPublisher.Conflict ConflictError

My log contains the following message:

INFO ZPublisher.Conflict ConflictError at /VirtualHostBase/http/my.host.org:80/MySite/VirtualHostRoot/_vh_MySite/some-folder/mportal_factory/MyTypes/mytype.2010-03-26.5609762949/@@plone_lock_operations/refresh_lock: database conflict error (oid 0x02 d2e1, class BTrees._IOBTree.IOBucket, serial this txn started with 0x0385090b54cf6f88 2010-03-26 02:51:19.877413, serial currently committed 0x0385090b54cf6f88 2010-03-26 02:51:35.450306) (1 conflicts (0 unresolved) since startup at Fri Mar 26 03:55:41 2010)

It seems similar to the message in http://n2.nabble.com/ZPublisher-Conflict-ConflictError-td339922.html. In my case, a package webcouturier.dropdownmenu is used and 'Depth of dropdown menus' is set as 3, without enabling caching. Since there are more and more items added to the folder, 3 levels of dropdown menus bring us problem. After the level is set to 2, the page response time much improves. Problably the BTrees object is from cataloguing for dropdown menus.

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