Random connection lag in maple?

I seem to have been plagued with some strange lag. The usual symptoms are there, very slow looting, delay between actions such as skills/pots. The odd part is that it's only maple, and nothing else on the computer, other games included.

http://www.speedtest.net/result/1185043491.png

It was working fine earlier, until I went afk for an hour or so and left the game alt tabbed. (No one else used the computer during this time.) Figured a restart would sort that out, but no luck. No one in alliance seemed to be lagging, so it likely wasn't the server itself.

Is there any way to troubleshoot this sudden lag, or am I forced to just wait for it to magically disappear the same way it came out of nowhere?