GraphX had an even-poorer showing in 2016 in the BigDatalog paper:

http://yellowstone.cs.ucla.edu/~yang/paper/sigmod2016-p958.p...

I wouldn't hold your breath on it getting faster.

Edit: and if you are interested in state-of-the-art stuff, here is a thread to start you out on the papers currently being presented at SIGMOD2018:

https://twitter.com/frankmcsherry/status/1002812204075364353