Even though I am clearly seeing that I have cleared and ran off....for me personally this is a major turn off in the game, since I am wasting a lot cash trying over and over again, seriously I think ANET should do something about this issue because personally it drives me up the wall.
Other then that the game is wonderfull

Pol
PS: I have a 4 megabyte connection which has been more then good since the 2 years I have been playing gw

I am on 512k connection, although the lag is extremely YUCKY sometime, (50k ping) I don't have 90% of the time getting stuck. probably 30-35% of the time I may get that extraordinarily huge lag spike which was also the cause of my ritualist losing her survivor title just 2k shy of level 2 .... but definitely not 90% of the time like OP say.