I am noticing the same performance issues. As a quick real-world test, I set up a torrent between a torrent client connected to 1 of the 4 servers and another torrent client connected to one of the other 4 servers. The speeds as indicated in the screenshot below (this is from the uploading client) barely got above 3 MB/s.
In previous tests that I did following this same methodology using the M247 servers when they were active, I was able to see speeds of usually 8-10 MB/s.
I also downloaded an Ubuntu ISO via BitTorrent on one of the clients. Using this as a test I was able to see download speeds above 25 MB/s for the torrent as a whole, and for a single peer, up to 13 MB/s.
Possibly as @ScanFarer stated, this could be worse routing from my ISP to Tzulo, whereas the route from Tzulo to my ISP seems to be fine based on the download speed observed for the Ubuntu torrent.