1. British isn't a race so no racism. Some servers wants 1 national only due to language such as germans, spanish, italians who in general have trouble with english hence work better playing with people from the same country.
Nothing new about it and seen it many times in other BF games and other team-worked based games(not CoD).
2. Lag is expected, it's a beta. We are suppose to find the bugs and problems and report them. And if you read the info, it clearly says Dice is aware of the lag and will fix it.