When we parsed server performance during raids DB wait times were almost the entire cause of lag and the rewrite should fix most everything related to DB wait times.
Since CoW is a multiple encounter raid dungeon and even a single raid can cause lag it would have been a lag fest without the DB rewrite. That is why even though we have been finished with the first wing of CoW for a while we haven't pushed it live because it wouldn't perform horribly if 3 or 4 raids tried to do it at the same time.
Our code team has finished their part of the DB rewrite we need to wait for other teams to convert our character files and servers over to the new system and that process is taking a long time for various reasons. As soon as they finish their part of the conversion we should start moving ahead very quickly.
