I'm using friend's krypt us server and another ramnode's server. The rtt between two server is 1MS, and I can get 50+MB/s speed. Then I use tc to add latency to 250MS But now I find that hybla not that slow, It's only takes 5seconds to download 6MB data! And htcp can transfer 6MB data wihthin 4seconds.
Now I think slow speed is vmware's compatibility problem.