I've noticed that after reinstalling the game since yesterday (2/8/2015), I haven't dc'd at all. I have even managed to do amdapor keep hard and the wanderer's palace hard without noticing any big lag or dc. I intend to test out if I can do 8 player stuff, and if that works move on to a crystal tower raid and see how that goes. Will update sometime tomorrow (2/10/2015)