most web sites don't work on the train

Twitter doesn't work at all.  Everything is "sorry something went wrong".  The connection is a bit glitchy, but not that bad.  I've downloaded several hundred MB, and simple web sites have worked fine.

Twitter, being based on short text messages, would be ideal for being reliable, but is one of the least reliable web sites I've ever used.  The slightest glitch in one's internet connection, for example on a train, and everything is "sorry something went wrong", even what should be very simple and basic pages.

Gmail also fails pretty badly, becoming unresponsive and giving no indication of what is / isn't happening.  

Zoho failed before login, giving an ever-lasting animation of a cube bouncing around or something, with no progress ever happening beyond that.

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