Just to point it out, I play SK from Steam.

Ever since around... 2 days ago (Since I posted this), I've been experiencing quite a horrendous amount of lag in my SK Cilent. Just like what SK lag is renowed for, I get thrown around, walked super-fast then super-slow, there is an approximately half a second delay to do anything, and the lag has never left ever since it came.

I live in Asia, Indonesia spefically, and plays on the USA server, but until now I've never experienced this lag before, everything used to run smoothly for me (although my connection bar is always stuck at one). I don't have any problems playing other online games such as TF2, Ragnarok, etc.

I've tried to turn of Xsync as recommended by my friends as it "should" reduce lag spikes. I've tried enabling and disabling it a couple of times with no avail.
The game is almost unplayable for me now, I have a T3 character and he nearly got killed on Depth 1 because of the countless times he teleported into brambles and spikes.

Just for the note, my modem is working just fine, I've checked it.
Can anyone point out the problem here or is it just connection problems to the USA server?