Loading of login and registerform takes narly a minute

I successfully installed um, and all setup worked fine, it created the pages and so on.

I added register and logon to the menu. But when you click on anmelden or registrieren, it takes forever to load the login or register form

Could you please advice what may be wrong

Thank you

I have 2.5.1 installed

The page I need help with: [log in to see the link]