best solution is to remove all cs from instances.

i never watch cs but for those that want to, they should be able to enjoy the viewing.

so, have a long intro cs outside, when first opening access to the instance at the corresponding npc, as i said before ,make it very epic for those that do enjoy cs, ppl should be able to enjoy the story if they choose to.

but this way it never affects any dungeon runs be it regular or speed.
neither type of player then is affected.