Any stress-tests done after 2015? I was considering running a small test using Bitcoin transactions when I ran into the stress-test / DDOS that Coinwallet.eu conducted in July 2015 (and maybe September too, I am not really sure) where they bombarded the network with small transactions.

Were there any similar tests done? Are their results available? I am trying to find more information on what happen to transaction propagation times, block propagation times, etc, in presence of high volumes of transactions. Pointers to the right directions will be highly appreciated.

P.S. I am studying the behavior of crypto networks, so testnet tests are not really representative, in general, because of their small scale and different bandwidth characteristics, to the best of my understanding.
The 2015 stress test aimed to hit 200MB of backlogged tx, they only hit 15MB as reported by coindesk.

Blockchain.info reports that the backlog of tx hit 120MB May 16th 2017. It's mostly been above 20MB for the last 60 days as of this post.

How big of a stress test is big enough for you?