I got a steady 4 MB/s on mine.
The new replacement for Limbo is pretty awesome. It's non-stop carnage, and as a Hulk who knows what bad feels feels like, it isn't as brutal as current Limbo at all. I feel fairly confident just being solo in there, at least in the 40-44 bracket (since I am 7 levels behind the live server version). The amount of action going on does makes it more like a more steady but manageable amount of incoming damage; I actually ran out of medkits for the first time in ages because I wasn't dying, but I was hitting them fairly frequently when trying to fight off supervillain trios alongside packs of monsters. The only lame encounter I've seen so far is the Mega-Sentinel, who feels ripped straight out of Limbo 3 wave 5-6.
There's 2 hours or so of it that I just finished streaming a while ago if you're interested in what it looks like without having to DL the test server:
link