Yes, and if you do know why it lags then why you try to argue over any caster in there if it's a moot point? Caster dps sux either way vs a melee in there, even if you spam all you got you don't do nearly as much. Regardless the important thing is, you don't spam so fast. A ~1000 points of disint and the rest of the arsenal every couple of seconds is nowhere near as process intensive like 5-8 types of individual damage / hit totalying up to like 70-100 procs every second.
But as apparently you know that as well, I don't get why we need this discussion now...