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Czuch: it will definetly not speed things up since the data is still there just not visible. It could slow thing sown because you are now downloading off two servers but my server is very fast so it should not make much of a difference.
CSS will only change looks not speed(at least not improve).
(hide) Play a game in real time with an online opponent! For this to be possible, you and your opponent have to select the action "Move and stay here" as default and then reload the page with the F5 key! (TeamBundy) (show all tips)