G'day.
Latency in online games is a huge factor for smooth and enjoyable gameplay.
My personal experience with running SK, coming from SEA region, is that a latency of approx < 270ms and jitter/variance of < 10ms (all as per pingtest.net) is still manageable and does not result into lagging into traps/shadow fire, ghosting through walls/impassable objects, delayed attack hits, rubber banding, etc. Also, it is imperative that the SK client be forced to connect only to US East as it is geographically closer in terms of submarine cables.