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 * Various microoptimisations to knit and gzip - reducing function call 
   counts in inner loops, reducing double-handling of data, increasing
   knit header parsing performance, removing 'list.index' calls
   completely etc.
 * changes the data format of knits to remove an extraneous \n in the 
   compressed content data, which lets it be trivially pulled into 
   memory in a single 'readlines()' call.
 * changes the knit repository to use unannotated knits for inventory,
   revisions, and signatures. Also turns off delta-compression for
   revisions and signatures.

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bzrlib/repository.py
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import bzrlib.gpg as gpg
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from bzrlib.graph import Graph
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from bzrlib.inter import InterObject
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from bzrlib.knit import KnitVersionedFile
 
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from bzrlib.knit import KnitVersionedFile, KnitPlainFactory
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from bzrlib.lockable_files import LockableFiles, TransportLock
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from bzrlib.lockdir import LockDir
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from bzrlib.osutils import safe_unicode
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        """
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        result = Graph()
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        vf = self._get_revision_vf()
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        versions = vf.versions()
 
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        versions = set(vf.versions())
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        if not revision_ids:
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            pending = set(self.all_revision_ids())
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            required = set([])
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                    raise errors.NoSuchRevision(self, revision_id)
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                # a ghost
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                result.add_ghost(revision_id)
 
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                # mark it as done so we dont try for it again.
 
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                done.add(revision_id)
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                continue
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            parent_ids = vf.get_parents_with_ghosts(revision_id)
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            for parent_id in parent_ids:
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                    # no, queue it.
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                    pending.add(parent_id)
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            result.add_node(revision_id, parent_ids)
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            done.add(result)
 
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            done.add(revision_id)
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        return result
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    def _get_revision_vf(self):
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    def _get_control_store(self, repo_transport, control_files):
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        """Return the control store for this repository."""
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        return self._get_versioned_file_store('',
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                                              repo_transport,
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                                              control_files,
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                                              prefixed=False,
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                                              versionedfile_class=KnitVersionedFile)
 
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        return VersionedFileStore(
 
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            repo_transport,
 
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            prefixed=False,
 
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            file_mode=control_files._file_mode,
 
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            versionedfile_class=KnitVersionedFile,
 
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            versionedfile_kwargs={'factory':KnitPlainFactory()},
 
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            )
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    def get_format_string(self):
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        """See RepositoryFormat.get_format_string()."""
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            file_mode = control_files._file_mode,
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            prefixed=False,
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            precious=True,
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            versionedfile_class=KnitVersionedFile)
 
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            versionedfile_class=KnitVersionedFile,
 
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            versionedfile_kwargs={'delta':False, 'factory':KnitPlainFactory()})
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        return KnitRevisionStore(versioned_file_store)
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    def _get_text_store(self, transport, control_files):