It is really really slow.
Is there a reason why you have to use phpbb3? It is not the final version yet. If there is no specific feature you need from phpbb3, I’ll suggest you to use the stable version phpbb2 which is available in goodies --> one-click installs.
If you still encounter the same problem after you switch to phpbb2, probably you are in a bad server (no luck) and should seek DH support for help.
Btw, you use flash movie in your home page but forgot to provide a loading bar. I was confused at the first time. I thought there was only a black screen in your home page.
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