@vapourminer and @Teress: Do you think that the server's response time is so important? If I ping eu2.ethermine.org I get 40-500ms response time (I'm from Budapest and I use a cable internet connection provided by Telekom).
even with my 200-300 ms pings my rejects are pretty much in line with everyone elses that have ~100 ms pings. basically my rejects are < 1%. and ive been mining with wireless 3g evdo since 2011.
once you hit over 500 ms i would think you would be losing shares.