Personally its been some time since Ive seen any noticeable lag on AB with mechanics/spellcasting. I certainly dont get any at all for ST3 (as one of the top dps in guild for the event I would notice). Occassionally we get chat spikes and I do remember ping being a bit higher just over a week ago but even then nothing that affected performance. A few guildies have had issues recently but from the comments Ive seen, its either cleared after gating or seems more of an issue thats specific to them. My options are such that I hide other ppls+pets dmg (we have experts that regularly post parses so I dont need to) and I have spam windows that I keep minimised.