--- a/mercurial/bundle2.py Mon Jan 22 12:23:47 2018 -0800
+++ b/mercurial/bundle2.py Sat Jan 20 22:55:42 2018 -0800
@@ -183,7 +183,7 @@
_fpayloadsize = '>i'
_fpartparamcount = '>BB'
-preferedchunksize = 4096
+preferedchunksize = 32768
_parttypeforbidden = re.compile('[^a-zA-Z0-9_:-]')