This was brought up at the Dev Meet and Greet and the problem that exist is the amount of Special effects from the boss monster at the end of the event has which is Causing lag and unplayable situations. to Solve this simply limit the amount of Specials the EMs are allowed to put on their Bosses at the end of the event Most EMS put several specials on the monsters to make them more challenging which is understandable at the same time but it is causing players who don't multi-box to have a disadvantage to those who do have about 15 accounts there.
Shard bound drops fixes everything
mopping up all the mutlibox wraiths hanging around waiting to just hit the final boss will fix everything
I am sure the team is aware of those problems and have taken action in some cases as you can see in the Newsletter. Also making it 1 IP per EJ account also helped with people multiboxing but the overall issue with lag I believe is the Particle effects from the final bosses and the amount of players there (Which this part is uncontrollable) Every player has the right to join in on an Event and I do personally enjoy attending them until the final boss which then I am stuck dead until the boss is dead and all of a sudden I can move. I urge for constructive Ideas on how to fix this problem rather then Complaining about things we dont have any control over.
I can agree to that actually