Did something happened recently, i used to be using Singapore Amazon EC2 and my ping for the past 2 weeks been stable at 200-214ms. Since last Tuesday, my ping jumped to 300ms, and now constantly fluctuate at 265-300ms.
Did you visit http://mudfish.net/admin/user/rtt_map link too? It shows following other routes: http://imgur.com/If9iBXw