My FC did a Titan HM run to help a member get his last relic for "Insatiable" and OMG the lag was sooooooo bad. We wiped so many times. On one person's screen they would be casting or moving, and on someone else's screen it looked like people were eating landslide and wotl on purpose. Lustrates and raises weren't going off. We finally had a long enough period of no lag to beat it, but that was after about four wipes and with less than ten minutes left in the instance. And we all have different ISPs as far as I know so I don't know if it was the internet's fault.