Crippling lag spikes

[Kanfoxy]

I've noticed in particular epic content zones that large spawns will cause crippling lag spikes, quickly leading to repeated full party wipes. So far, these are the fights we've encountered them on:

Friends in Low Places - Final encounter.
A Lesson in Deception - Final encounter.
Through a Mirror Darkly - Warping to a new area with multiple spawns via the mirror.
The House of Death Undone - Encounter when aggroing final boss, and whole room goes attackable.

Effect: The lag hits all members of the group inside the instance. It starts with rubber banding, and quickly grows to complete immobilisation. Abilities can be used, but don't seem to take effect for sometimes up to fifteen or thirty seconds after the button's been pushed.

While rubber banding can cause a drop in framerate, the lag itself doesn't appear to affect normal machine function. I have a rather decent gaming rig, so going in I'm pretty confident it's not a local latency issue. To confirm this, a glance at resmon confirms that DDO isn't close to pegging any of the CPUs, nor is it running out of available memory. Further, the fact that all six people in my group were experiencing the same effects simultaneously makes it vanishingly unlikely that this has anything to do with any particular person's machine.

I also play alts, and I have not yet encountered this issue in lower content. It's possible that this might be being caused by particular high-end abilities. Maybe an unresolved loop or collision in regards to some ED abilities, or some strange interaction when many epic mobs congregate together?

Regardless of the cause, though, there are some quests (such as the ones above) that I have failed on multiple occasions to complete--not because of the difficulty of the quest, but because of the lag spikes that seem to be built into the encounters.

Please could this get some attention? This is significantly impacting my enjoyment of the game, far in excess of the positives brought in by new content and enhancement streamlining.

I'd love to hear where else other people have encountered this, but please, keep it civil and constructive. Tired of posts with useful information for devs being locked and forgotten because of petty arguments and quibbling.

[Nodoze]

I've noticed in particular epic content zones that large spawns will cause crippling lag spikes, quickly leading to repeated full party wipes. So far, these are the fights we've encountered them on:

Friends in Low Places - Final encounter.
...

I also had terrible lag in the final of Friends in Low Places which made it really difficult.