Hello Gphwar and thanks for posting, also a warm welcome to the eForum.
Without being able to look into your account (on Spanish dongle number0 we can't really identify whether there are any problems, however speed is also dependant on what that specific Cell site is pushing out.
You could contact Vodafone Spain and get a reading on what the site is capable of. i would also advise alternating browser, my two favourites are Google Chrome and Opera 9which is especially quick), give these a try to see if there is a marked improvement.
Finally removing the sim from the dongle and inserting it into a mobile phone may help refresh its connection to the network.
Thanks
Reidar
eForum Team