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I too have experienced the problem of vodafone being slow, theres a similar post hanging around on boards.ie. Apparently they were supposed to have fixed what ever was slowing up the connections.
I rang them 3 weeks ago with this issue, I couldnt even log in, they asked for my account AND my password over the phone. I wouldnt give it to them over the phone so got no joy. They wouldnt believe it was their fault and they wouldnt put me on to technical guys, only the girl on the phone would field the qs. The site is next to useless as its a lottery as to whether the site is ever up.