> Are the values in your BTree implemented as persistent lists or some
> other subclass of Persistent?  That makes a big difference in the size
> of each commit to the BTree.
Yes, that is exactly the problem. We are using simple Python lists, and 
that implies rewriting the whole bucket.
Still, rewriting only the list won't be the best solution, since they 
can be pretty big sometimes. That's why I was looking for something like 
a BTree-based list (that actually seems to exist).



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