=== modified file 'groupcompress.py'
--- groupcompress.py	2008-07-25 02:50:05 +0000
+++ groupcompress.py	2008-07-25 20:18:06 +0000
@@ -484,6 +484,12 @@
         absent_keys = keys.difference(set(locations))
         for key in absent_keys:
             yield AbsentContentFactory(key)
+
+        # This is a special case when we are extracting a few texts from the
+        # same zdata chunk. It isn't perfect, but for revision texts we often
+        # grab several next to eachother.
+        last_read_memo = None
+        last_plain = None
         for key in present_keys:
             if key in self._unadded_refs:
                 lines, sha1 = self._compressor.extract(key)
@@ -492,9 +498,14 @@
                 index_memo, _, parents, (method, _) = locations[key]
                 # read
                 read_memo = index_memo[0:3]
-                zdata = self._access.get_raw_records([read_memo]).next()
-                # decompress
-                plain = zlib.decompress(zdata)
+                if last_read_memo == read_memo:
+                    plain = last_plain
+                else:
+                    zdata = self._access.get_raw_records([read_memo]).next()
+                    # decompress
+                    plain = zlib.decompress(zdata)
+                    last_read_memo = read_memo
+                    last_plain = plain
                 # parse
                 delta_lines = split_lines(plain[index_memo[3]:index_memo[4]])
                 label, sha1, delta = parse(delta_lines)