Hi ! We've been successfully using the boost serialization library on various industrial projects. One one occasion though, we had to make a modification in the source code in order to improve the performance of the process : The library uses a set (in basic_oarchive.cpp) to keep track of the serialized objects. In our project, a very high number of relatively small objects are serialized through pointers and references to each other, and the number of elements in the set could rocket to several millions. This led to memory fragmentation and very high performance hits after the first serialization (on a Windows XP platform at least). We just added a boost::fast_pool_allocator on the set of serialized pointers. The set is cleared in the destructor of the archive, after which release_memory() is called on the pool. This simple patch could reduce the time to perform a whole save from several minutes to a few seconds. Best regards, -- Adrien Gervaise MasaGroup SCI