Lat week Cocomajob stated that they made headway with the patch before the holidays to alleviate the crippling lag in the game and that only 1 restart per week was necessary.
I and a lot of the people i run with in high skull reapers and raids feel that this is false and currently running higher difficulty raids is next to impossible without multiple restarts per week (at least 3 Monday, Wednesday, & Friday). This would give us 12-18 hours before server lag kicks into overdrive and prevents raiding. Our guild has cut back on difficulty, I know of one guild that cancelled raiding altogether on their raid day to to lag.
The silence is deafening from SSG, for an issue that has been going on for the better part of 2 + months, we deserve updates / timelines on what is happening. While I have always tolerated some form of lag, this is insane to the point the game is no longer fun.