$ bzr --lsprof rio-test --limit 100 | head -n30
processed 100 inventories                                                      
extracted in 1.36s (13.6ms avg)
Times   read (s)        read avg (ms)   write (s)       write avg (ms)
xml:        2.70            27.0           11.98           119.8
rio:       10.37           103.7            5.56            55.6
ratio:    3.8471                          0.4642          1.0860
   CallCount    Recursive    Total(ms)   Inline(ms) module:lineno(function)
       29564        29464   9419.0500   4282.1730   elementtree.ElementTree:662(_write)
      +29464            0   9206.9930   4080.8820   +elementtree.ElementTree:662(_write)
     +169977            0   3192.1820   2025.3280   +bzrlib.xml_serializer:92(_escape_attrib)
     +199641            0   1412.0370   1412.0370   +elementtree.ElementTree:746(_encode)
      +29564            0    532.6580    343.6660   +bzrlib.xml_serializer:123(_escape_cdata)
         100            0   6798.0940   4256.0010   bzrlib.rio:213(read_stanza)
     +199441            0   1343.4640   1343.4640   +bzrlib.rio:105(add)
     +199441            0   1197.7450   1197.7450   +encodings.utf_8:15(decode)
        +100            0      0.8840      0.8840   +bzrlib.rio:95(__init__)
      399182            0   2767.8830   2767.8830   elementtree.ElementTree:746(_encode)
      199441            0   2167.2930   2167.2930   bzrlib.plugins.rio_inventory.rio_serializer:18(add)
      169977            0   3192.1820   2025.3280   bzrlib.xml_serializer:92(_escape_attrib)
     +169977            0   1166.8540   1166.8540   +elementtree.ElementTree:746(_encode)
      176182       117054   2479.6980   1728.0320   bzrlib.inventory:875(iter_entries)
     +117054        60554   1435.2430   1052.6180   +bzrlib.inventory:875(iter_entries)
     +111090            0    751.6660    751.6660   +posixpath:56(join)
       59288            0   3146.1810   1679.0090   bzrlib.xml5:137(_unpack_entry)
      +53288            0   1130.7470    651.0690   +bzrlib.inventory:644(__init__)
      +59288            0    219.6110    219.6110   +bzrlib.inventory:331(versionable_kind)
       +6000            0    116.8140     64.9890   +bzrlib.inventory:542(__init__)
       29464            0   3919.6050   1648.7840   bzrlib.plugins.rio_inventory.rio_serializer:80(_pack_entry)
     +199241            0   2163.1010   2163.1010   +bzrlib.plugins.rio_inventory.rio_serializer:18(add)
      +29464            0    107.7200    107.7200   +bzrlib.inventory:331(versionable_kind)