Time for another round of "pin the tail on the lag inducing donkey" - maybe they'll decide to nerf Warlock chain stance next, or Archmage SLAs (surely all those Magic Missiles flying around don't help). How about Dragon Lords using Whirlwind Attack?
Or maybe, you know, actually think about what has changed since the last time lag was (barely) acceptable - doesn't take a rocket scientist to work out that a class released 13+ years ago is not the main cause of your lag problem. Cordovan has already said that they KNOW Night Revels is not helping the situation - doesn't help the 64 bit slideshow generator, but would be a good place to start on the live servers.
I will say that all the lag stutters that happen, have all the hallmarks of an SQL lock / wait. I don't know what relational database they use for DDO, but I'm sure that its schema, when designed in the mid 2000's, was not built with virtualization in mind. Virtualizing database servers has always been an iffy idea at best, and not something I would ever recommend to a customer with a high transaction count DB.