I did some digging and found the actual Stanford U. presentation from Brian Levine, at Scaling Bitcoin / 2017
Graphene outperforms everything else going by a factor of ( I believe after scanning the presentation) of roughly 10:1
-- Could not shrink this or you would not be able to read the small print, sorry.
• Graphene’s block announcements are ⅒ the size of current methods. (page 63)
" Graphene: A New Protocol for Block Propagation Using Set Reconciliation. "
Thanks for reading, have a nice day.