Yes, this is a known problem, due probably to the BLOB hack
and the somewhat inefficient code of file-storage. Don't blame
the BLOB hack, though, it is a great fix. It's just not efficient for
large single BLOBs (lots of copying of data going on).
Yes, the new-file-storage is massively faster. The most
inefficient part is the hierarchy calculation, and that will be
improved, too.
